Remove config from gitignore.
Optimize performance on very large IP sets.

+ Ensure file i/o overhead is to a minimum by making the
`config` local variable into a class-level variable.
+ Minimize IP seek time by using hash instead of array while
maintaining compare by subnet mask functionality.
Move config instantiation so rake can run properly.
Move alpaca config into templates.
Bump minor version.
Bump lock minor version.
Merge branch 'master' of https://github.com/jeffchao/alpaca

Conflicts:
	lib/rack/alpaca.rb