Implement request tagging and pause/resume support
Use new pause/resume support in sample app
Merge pull request #665 from lucasr/request-group

Implement request group and pause/resume support
Fixed calculating inSampleSize for centerInside images
Merge branch 'krzysiekbielicki-issue-616'
Simply fail if assertion is not thrown
Merge pull request #673 from f2prateek/fail/test

Simply fail if assertion is not thrown
Notify exception listener rather than crash when no available handlers.
Merge pull request #678 from square/jw/fix-missing-handler-behavior

Notify exception listener rather than crash when no available handlers.
Fix typo
Merge pull request #679 from square/dimitris/typoz

Fix typo