Custom templates shown in settings

Ability to specify directory for custom templates existed, but default
settings has not shown it. Note: Adding custom templates to MavensMate
repository as well.
Update help text

Show example of full path, indicating that it does not have to be in
the workspace directory
Merge branch 'master' of https://github.com/dschach/MavensMate-SublimeText

Conflicts:
	mavensmate.sublime-settings