Updated to support CocoaLumberjack 2.x.

Currently, CocoaLumberjack has a prerelease version out for 2.0 which is used by default if your podfile doesn't explicitly specify an earlier version. I tried to make the dependency in the podspec '~> 2.0' so it would match 2.0.x, 2.x, but not 3.x, but it wasn't matching the current CocoaLumberjack version tags which are named like "2.0.0-beta", "2.0.0-beta2", "2.0.0-rc", etc. I think it had a problem with the dash suffix. So, I made it specify '> 1.9.2' (1.9.2 is the last 1.x version). Shouldn't be an issue until CocoaLumberjack 3.x comes out since it will still match 3.x versions.

Also, I'm not sure how you wanted to handle the Flannel version number. I just bumped it to 1.0.2.