look for python2 before python for default .emscripten

emscripten requires python 2 but some systems have multiple versions of
python installed and the 'python' binary will correspond to python 3. We
now explicitly look for a python2 first when setting up a default
.emscripten config file.

AUTHORS

@@ -68,4 +68,5 @@ a license to everyone to use it as detailed in LICENSE.)
 * Llorens Marti Garcia <lgarcia@imvu.com> (copyright owned by IMVU)
 * Jinsuck Kim <jkim@imvu.com> (copyright owned by IMVU)
 * Todd Lee <tlee@imvu.com> (copyright owned by IMVU)
-* Anthony Pesch <inolen@gmail.com>
+* Anthony Pesch <inolen@gmail.com>
+* Robert Bragg <robert.bragg@intel.com> (copyright owned by Intel Corporation)

tools/shared.py

@@ -124,7 +124,8 @@ else:
     config_file = config_file.replace('{{{ NODE }}}', node)
     python = 'python'
     try:
-      python = Popen(['which', 'python'], stdout=PIPE).communicate()[0].replace('\n', '')
+      python = Popen(['which', 'python2'], stdout=PIPE).communicate()[0].replace('\n', '') or \
+               Popen(['which', 'python'], stdout=PIPE).communicate()[0].replace('\n', '') or python
     except:
       pass
     config_file = config_file.replace('{{{ PYTHON }}}', python)