use int as roomid everywhere

appinfo/database.xml

@@ -70,9 +70,9 @@
 			</field>
 			<field>
 				<name>roomId</name>
-				<type>text</type>
+				<type>integer</type>
 				<notnull>true</notnull>
-				<length>255</length>
+				<length>4</length>
 			</field>
 			<field>
 				<name>lastPing</name>

appinfo/info.xml

@@ -6,7 +6,7 @@
 	<licence>AGPLv3+</licence>
 	<author>Lukas Reschke, Jan-Christoph Borchardt</author>
 	<default_enable/>
-	<version>1.0.14</version>
+	<version>1.0.15</version>
 	<dependencies>
 		<owncloud min-version="9.1" max-version="9.2" />
 	</dependencies>