Squashed 'legion/' changes from df31d93..51883e8

51883e8 Updating README with a pointer to the new Legion homepage
9dfd4a7 Updating build system
c1e37bf Fixing some bugs and updating examples
30ec933 Adding example codes and pushing some bug fixes
0db0981 More updates and bug fixes
674616e Lots of bug fixes and performance optimizations added to both high and low level runtimes
cc4ac28 Major update to the compiler. Bug fixes, performance improvements, and examples.
7601931 New version of the Legion runtime system.  Many new features and bug fixes included
6621a98 Compiler bug fixes, performance improvements. More examples.
d7a1310 Runtime bug fixes and performance improvements.

git-subtree-dir: legion
git-subtree-split: 51883e830238b6eb7f0058fc0953c2d3a7e7f1cc
Merge commit '29ded19a307e2610c22e9c75a7ab1b4b144595dd' into overhaul