Integrate git2go and stop shelling out
Refactor encapsulate functionality, call from main
Add prepare script for deps and env vars
Ignore local libgit2
Update README for linux build instructions
Update setup script

Script will now run properly when libgit2/git2go has not been previously
installed. Script will clone git2go and build libgit2 and set all
environment variables accordingly.
Ignore tags directory
Ensure local config is found from subdir
Move testing support functions into own file
Remove whitespace
Introduce makefile and remove build script