implement syntax-rules
need to fix
* number->string
* check-vars
* vector pattern/template
fix bugs around matching (... p <ellipsis> ...) pattern
remove debug code
bug fix
add support match/expand vector
remove redundunt code
fix bug on matching string litral
fix bug of matching symbol literal
<literal> superiors to <ellipsis>, when there is conflict
Merge remote-tracking branch 'upstream/master' into syntax-rules
remove definition of number->string
clean up code
move code from piclib/syntax-rules.scm to piclib/built-in.scm
Merge pull request #88 from zeptometer/syntax-rules

add syntax-rules