Move adbLogCat and findAndroidManifest into separate repos

[glsignal]

This is really a minor niggle, but it would allow users to integrate your plugins with existing vim setups by adding them as submodules, rather than cloning the entire repo and symlinking them.

[tlvince]

@bpowell I've gone ahead with this (using git subtree) and housed them into a new vim-android organisation. Let me know if you're okay with this.