update volley lib
ActionBarSherlock
PinterestLikeAdapterView
DiskLruCache
android 4.4 sdk
use JakeWharton's disk cache
async bitmap caching, some logging, disable memory cache
externals
close #96 don't reload same images int ThumbnailView, memory cache flag
close #97 add size=... to thumbnail urls
close #98
close #99 fix NPE and report an error
close #100
close #102
close #103
mrege from issue-99, close #104
mrege from issue-99, close #105
close #106
merge from issue-98,issue-99,issue-100,issue-102,issue-103,issue-104,issue-105,issue-105
Merge branch 'issue-99' into develop