* Changed some declarations from explicit to auto.
* Changed "mkdir --parents" in Makefile to "mkdir -p" since OSX doesn't support the long version.
* REMAINING ISSUE: The "ln -sf" for installing the libraries at the end will fail if the DMD installation point is not owned by the user performing the build. A "sudo ln..." fixes this, but it still may not be ideal to have a system-level link to a user-level file. This should probably simply be copied instead. Also, this copy should perhaps be done manually or in an "install" step, since a user may want to build Phobos and test it out without affecting other users.
* Transformed std.c.linux.* into wrappers around core.sys.posix modules where appropriate.
* Added std.c.osx as the OSX equivalent of std.c.linux.
* Added std.c.osx.socket for OSX-specific socket declarations not covered by the Posix spec.
* Altered all makefiles to zip, etc, the new std.c.osx package.
* std.contracts: Added file and line information to enforce. Added errnoEnforce that reads and formats a message according to errno. Added corresponding ErrnoException class.
* std.encoding: For now commented out std.encoding.to.
* std.file: Fixed bug 2065
* std.format: Fixed bug in raw write for arrays
* std.getopt: Added new option stopOnFirstNonOption. Also automatically expand dubious option groups with embedded in them (useful for shebang scripts)
* std.math: improved integral powers
* std.md5: Improved signature of sum so it takes multiple arrays. Added getDigestString.
* std.path: changed signatures of test functions from bool to int. Implemented rel2abs for Windows. Improved join so that it accepts multiple paths. Got rid of some gotos with the help of scope statements.
* std.process: added getenv and setenv. Improved system() so it returns the exit code correctly on Linux.
* std.random: added the dice function - a handy (possibly biased) dice.
* std.file: added support for opening large files (not yet tested)
* std.utf: added the codeLength function. Got rid of some gotos.
