fixed image path for unix, reformatted code for consistency with the rest of the code base
Merge pull request #50 from biometrics/pr/49

Pr/49
fixed GCC errors and warnings
fixed msvc error
fixed remaining MSVC warnings
renamed variables for consistency, removed Windows specific functionality
added benchmark -file
added benchmark --verbose
incremental likely_eval progress
changed likely_ast_from_string interface
deprecated likely_tokens_to_string
changed interface to likely_ast_from_tokens
removed likely_ast_to_tokens
introduced likely_ast/asts_from_string differentiation
improved likely_ast_from_tokens error handling
exposed likely_ast_from_tokens_at, finished frontend refactoring
proper error handling for missing literals
factored out common finalization code
refactored optimization logic to more closely resemble opt
tweaks to more closely mirror opt