Remove dependencies on Ignition

[rock3r]

We're going to have lots of issues because Ignition does depend on Guava, which has refactored and changed lots of MapMaker's APIs, and Ignition only uses Guava because of MapMaker. It's also a pretty huge dependency, since Guava occupies a lot of storage space, which would be for the most part wasted space (we never use those methods and classes). Furthermore, Android's Support Library v4 now provides a retrocompatible version of LruCache, which should do the trick replacing Guava's MapMaker.