Update README.md

Added troubleshooting section pertaining to git- and Xcode-related path settings and versions.
Merge pull request #161 from jnozzi/patch-1

Update README.md
Supermarinification of everything.
Merge pull request #164 from neonichu/supermarin-all-the-things

Supermarin ALL the things!
Fixes #174 - sort plugins case-insensitively
Add support for Xcode 6 GM
bump version to 1.0.8
Bump version 1.0.8