build blockhelpers table into context
detect block custom helper usage
support block custom helper. regression pass, but not tested on new feature
update doc
fix compile error
fix for wrong lookup
fix new context
update doc/his
fix for wrong named arg error detect
fix for number as named argument
fix for float number as named argument
update his
fix issue
update doc
refine doc
refine doc
Merge pull request #14 from zordius/block_custom_helper

Block custom helper