Made test podfile refer to local podspec
Integrate leveldb thru pod
Bumped required leveldb pod version to 1.17.1
Bumped pod version to 2.0.8
Changed upstream leveldb to a github mirror
Revert "Integrate leveldb thru pod"

This reverts commit 43ab5451380388ad5cf469bf67316b6fdbaade74.

Conflicts:
	Objective-LevelDB.podspec
Merge branch 'refs/heads/back-to-submodule'
Fixed test setup
Keyed subscript for getter/setter
Bumped to 2.1.0