Load Crittercism key from assets folder.
Add the file with the key to gitignore

See #111.

Conflicts:
	.gitignore
	enabler/src/com/openxc/enabler/OpenXcEnablerActivity.java
	enabler/src/com/openxc/enabler/utils/AppConst.java
	enabler/src/com/openxc/enabler/utils/AppUtils.java