Merge branch 'release/1.7.2'
Merge branch 'release/1.7.2'
crash fix by applying patch from https://github.com/Cocoanetics/DTCoreText/issues/775 -http://redmine.purplemotion.com/issues/2891 (refs #2891)
Merge branch 'hotfix/1.7.3'
Merge tag '1.7.3' into develop

fix iOS8 crash