Apothecary Update for Xcode 6 and new SDKs

- Using Xcode defaults now (so more dynamic) for iOS SDK, OSX SDK
- Set default SDK levels to current
Documentation for ofVideoGrabber's base classes.
Merge branch 'master' of git://github.com/openframeworks/openFrameworks into documentation-baseclasses
Additional base class documentation.
Clean up spaces.
Convert spaces to tabs to match existing.
Update to use links rather than enumerations -- future proof.
Update to fix typos and add template params.
Updates to fix typos.
Updates to fix typos.
Move documentation from implementation to header.
Merge branch 'master' of git://github.com/openframeworks/openFrameworks into documentation-ofImage
Minor grammar/code example fixes
Merge pull request #21 from mikewesthad/documentation-baseclasses

Minor grammar/code example fixes for documentation
Still brewing.
Merge pull request #3251 from danoli3/apothecary_update

Apothecary Update for Xcode 6 and new SDKs
Extract android root in apothecary (required for other apothecary PRs).
Merge pull request #3443 from bakercp/android-apothecary-update

Extract android root in apothecary (required for other apothecary PRs).
Throw error on missing android toolchain for apothecary.
Merge pull request #3444 from bakercp/android-apothecary-update

Throw error on missing android toolchain for apothecary.