Version 0.1
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* Initial release
* Core compiler analyses, optimizations
* LLVM code generation
* Pluggable IR (custom opcodes)
* Simple type system (int, float, bool, pointer, struct, function, void)
* C IR parser

Version 0.2
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* Add sparse condition constant propagation (SCCP) and constant folding
* Out-of-SSA translation (reg2mem)
* Add vector and array data types (thanks to Fil Mackay)
* Add IR tracer
* Support recursive types
* ctypes -> pykit type
* Fix inliner for exception blocks
* Include custom pycparser
* Preliminary C backend
* Improve IR builder
* Improve IR interpreter
* Improve IR pretty printing
