Leg support#18

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brucehsu wants to merge 13 commits intopointlander:masterfrom

Commits on Mar 5, 2014

Use '=' and '|' for LEG grammar
brucehsu
committed

Commits on Mar 6, 2014

Use LEG grammar identifier
brucehsu
committed

Commits on Mar 8, 2014

Statically semantic value complication
brucehsu
committed

Commits on Mar 9, 2014

Dynamic semantic variables manipulation
brucehsu
committed

Commits on Mar 12, 2014

Rewritten Makefile and restructure directory hierarchy
brucehsu
committed

Commits on Apr 8, 2014

Add \n to restore code segment to avoid possible syntax error
brucehsu
committed

Commits on Apr 9, 2014

Resembles stack operations of original C version, tested with calculator example
brucehsu
committed

Commits on Apr 15, 2014

Correctly push/pop stack index
brucehsu
committed

Commits on Apr 16, 2014

Substitute YYSTYPE instead of use directly
brucehsu
committed