Update line ending rules and make things executable

Replaced our gitattributes file with the one corefx uses. It is more crossplatform friendly.
Mde init-tools.sh executable.

.gitattributes

@@ -1,82 +1,67 @@
 ###############################################################################
 # Set default behavior to automatically normalize line endings.
 ###############################################################################
-
-[attr]wintext text eol=crlf
-
 * text=auto
 
-# Default
-*.* wintext
+###############################################################################
+# Set default behavior for command prompt diff.
+#
+# This is need for earlier builds of msysgit that does not have it on by
+# default for csharp files.
+# Note: This is only used by command line
+###############################################################################
+#*.cs     diff=csharp
 
-# Build Specifications
-*.sln	wintext
-*.props	wintext
-*.proj	wintext
-*.targets	wintext
-*.tasks	wintext
-*.overridetasks	wintext
-*.csproj	wintext
-*.rptproj	wintext
-*.vcxproj	wintext
-*.filters	wintext
-*.cd	wintext
-cibuild.sh text eol=lf
-init-tools.sh text eol=lf
+###############################################################################
+# Set the merge driver for project and solution files
+#
+# Merging from the command prompt will add diff markers to the files if there
+# are conflicts (Merging from VS is not affected by the settings below, in VS
+# the diff markers are never inserted). Diff markers may cause the following 
+# file extensions to fail to load in VS. An alternative would be to treat
+# these files as binary and thus will always conflict and require user
+# intervention with every merge. To do so, just uncomment the entries below
+###############################################################################
+#*.sln       merge=binary
+#*.csproj    merge=binary
+#*.vbproj    merge=binary
+#*.vcxproj   merge=binary
+#*.vcproj    merge=binary
+#*.dbproj    merge=binary
+#*.fsproj    merge=binary
+#*.lsproj    merge=binary
+#*.wixproj   merge=binary
+#*.modelproj merge=binary
+#*.sqlproj   merge=binary
+#*.wwaproj   merge=binary
 
-# Sources (Managed)
-*.cs	wintext
-*.vb	wintext
-*.resx	wintext
-*.xaml	wintext
-*.config	wintext
-*.manifest	wintext
-*.txt	wintext
-*.tst	wintext
+###############################################################################
+# behavior for image files
+#
+# image files are treated as binary by default.
+###############################################################################
+#*.jpg   binary
+#*.png   binary
+#*.gif   binary
 
-# Sources (Web)
-*.html	wintext
-*.css	wintext
-*.js	wintext
+###############################################################################
+# diff behavior for common document formats
+# 
+# Convert binary document formats to text before diffing them. This feature
+# is only available from the command line. Turn it on by uncommenting the 
+# entries below.
+###############################################################################
+#*.doc   diff=astextplain
+#*.DOC   diff=astextplain
+#*.docx  diff=astextplain
+#*.DOCX  diff=astextplain
+#*.dot   diff=astextplain
+#*.DOT   diff=astextplain
+#*.pdf   diff=astextplain
+#*.PDF   diff=astextplain
+#*.rtf   diff=astextplain
+#*.RTF   diff=astextplain
 
-# Sources (Native)
-*.h	wintext
-*.cpp	wintext
-*.rc	wintext
-
-# Sources (Xml)
-*.xml	wintext
-*.xsl	wintext
-*.xsd	wintext
-
-# Sources (Script)
-*.cmd	wintext
-*.bat	wintext
-*.rsp	wintext
-*.sample wintext
-*.pl	text eol=auto
-
-# Sources (Binary)
-*.doc  binary
-*.ico  binary
-*.appx binary
-
-# Configuration
-*.gitattributes	wintext
-*.gitignore	wintext
-
-#Binaries
-*.exe  binary
-*.dll  binary
-*.obj  binary
-*.pdb  binary
-*.zip  binary
-*.chm  binary
-*.nupkg  binary
-*.lex binary
-*.ocx binary
-*.mui binary
-
-#Images (Binary)
-*.png binary
-*.jpg binary
+# Force bash scripts to always use lf line endings so that if a repro is accessed
+# in Unix via a file share from Windows, the scripts will work.
+*.sh text eol=lf