Merge pull request #43 from hobu/master

hexer 1.3.0
hexer: add sha1
quazip: boneyard; in main tap now
brew-stack: install a formula and dependencies from pre-made bottles or as built bottles
brew-stack: better exec; handle failed bottle pour
iipsrv: new formula; high-performance image server for ultra high-resolution images

- Based off of https://github.com/Homebrew/homebrew/pull/30563
- No tagged releases that compile, yet (beyond 0.9.9)
- Not tested with Apache, yet
qgis-24: clean up formula; remove skip-stdlib-check option
qgis-24: fix Qsci header path
qgis-24: update .app bundle identifier regardless of build type
qgis-24: if Homebrew Python, make sure its found first
qgis-24: ensure CMake bool options always match formula's install options
qgis-24: fix PYTHONHOME; set install's site-packages first
qgis-24: patch backports and bump revision to 2
grass-64: fix finding of wx module for system python
grass-70: fix finding of wx module for system python
qwtpolar: now in main Homebrew tap
qwt60: boneyard
wxmac-29: boneyard
grass-70: beta3; add mavericks bottle
grass-64: add mavericks bottle