TUNDRA_NO_BOOST - make Boost a optional dependency

-Opening up for discussion and review; will be making at least one more commit in the near future
-re: #595
-rationale: Boost is huge (around 70k files, takes around 2 gigs of disk space) and unneeded - the used features can be found already from the C++ standard library (TR1 and/or C++11) and Qt
-built, run, and tested (Avatar and Physics scenes) with VS2008SP1 and VS2010SP1
-TODO: GCC support - the information which GCC versions introduced TR1 features was hard to come by