universal_archs returns ArchitectureListExtension
Skip the check for Xcode on non-OSX systems
git: Disable OS X keychain helper Closes #1
GCC is named gcc-4.2 on MacOS and gcc elsewhere
brew update: Pull from the branch linuxbrew

Taps still pull from the branch master.
Closes #4
Disable m32 and m64 on non-OSX systems. Closes #8
Replace the README for Linuxbrew

Add some basic documentation.

Closes #10.

Add ruby 1.8.6 requirement

For now, it seems that homebrew-core requires Ruby 1.8.6

Known limitations of Ruby 1.8.5:
* RUBY_PATCHLEVEL is not defined
* instance_variable_defined? is not defined
* pathname.rb:223 - 'Digest::SHA2' => 'Digest::SHA256' is necessary

Closes homebrew/linuxbrew#12
Closes homebrew/linuxbrew#15

Add instructions to set LD_LIBRARY_PATH in .bashrc

Closes #9
Skip the compiler version check on non-OSX systems

Closes homebrew/linuxbrew#5
When the root cache is not writable use home_cache

The home_cache is `~/Library/Caches/Homebrew` on MacOS and
`~/.cache/Homebrew` on other systems.
Closes Homebrew/linuxbrew#17.
boost: Fix for non-OSX systems
Merge branch 'master' into linuxbrew

Conflicts:
	Library/Homebrew/cmd/update.rb
	Library/Homebrew/extend/ENV/std.rb
Merge branch 'master' into linuxbrew

Conflicts:
	Library/Homebrew/global.rb
	Library/Homebrew/macos.rb
Use OS.mac? rather than MACOS
home: Use `xdg-open` on Linux and `open` on Mac OS

Closes homebrew/linuxbrew#28
New environment option, `--env=inherit`

Pass the current CC/CXX environment through to the build environment
with `--env=inherit`. This option allows passing the user's C compiler
environment variables through to the build environment and avoids
defaulting to the system gcc/g++, which does not work on module-based
Linux cluster distributions.

Closes Homebrew/linuxbrew#13
Closes Homebrew/linuxbrew#29
Merge branch 'master' into linuxbrew

Conflicts:
	Library/Homebrew/cmd/doctor.rb
Fix dynamically_linked_libraries for Linux
Merge branch 'master' into linuxbrew
Merge branch 'master' into linuxbrew
Merge branch 'master' into linuxbrew