first version of front-end build script that applies patches
initial set of patches that modify boost.sh

details:
- 01-replace-svn-by-git.patch: Replace all things related to Subversion with similar
  Git commands, because the Boost source code is obtained from a GitHub repo,
  not from the upstream Subversion repo.
- 02-xcrun.patch: Use xcrun to locate the compiler and the lipo and ar command line
  tools. The original script uses hardcoded paths that make assumptions about the
  inner structure of an Xcode.app bundle. This is sure to fail as soon as Apple changes
  something inside Xcode (there are reports that Xcode 5 already brings such a
  change).
- 03-remove-osx-build.patch: Remove the Mac OS X build since this repo is interested
  only in providing a Boost version for Fuego on iOS.
- 04-bjam-toolset-fix.patch: Boost 1.54.0 has some internal changes that cause the
  simulator build to fail with the current bjam command line. The solution is to use
  different values for the "toolset=" parameter for the iPhone and the simulator build.
  The specified value selects the appropriate configuration from the user-config.jam
  file.
- 05-deployment-target.patch: Add compiler flags that allow to specify the deployment
  target (i.e. minimum required version of iOS).
add .gitignore