remove the local.properties file (#1708)

* delete the local.properties file from the repository

* list local.properties in the ".gitignore" file

.gitignore

@@ -14,6 +14,7 @@
 /.classpath
 /.project
 /.settings
+/local.properties
 *.dll
 *.so
 *.jnilib

local.properties

@@ -1 +0,0 @@
-sdk.dir=C:\\AndroidSDK