Add an exception handler to Glide requests

Fixes #26
Call recycle on bitmaps not added to bitmap pool.

Fixes #33.
Expand exception handler to listen to load completion
Introduced methods to trim and clear the memory cache
Memory cache adapter implements new methods
Removed method from public api of memory cache
Recycling bitmaps when clearing cache
Merge remote-tracking branch 'shazam/shazam_memcache_trim_clear'
ignore inlined api for constants in LruMemoryCache
Merge branch 'add_exception_handler'

Conflicts:
	library/tests/src/com/bumptech/glide/GlideTest.java