cleanup bytecode loader
inlining pegvm_unconsume_charset into ParserContext_Execute
remove meaningless memset call in pegvm_make_charset
rename ParserContext_Destruct => ParserContext_Dispose
Merge pull request #9 from imasahiro/cleanup_loader

Cleanup BytecodeLoader
fixedNode
split stack into call_stack and stack for values
Merge pull request #10 from imasahiro/add_call_stack

split stack into call_stack and stack for values
fixed NODE_dump and NODE_new
merge fixedNode
add test_connect