Removed deprecated {!...} macros from doc
Merge pull request #16 from marian-r/doc

Removed deprecated {!...} macros from doc
typos
added & used Helpers::checkCallback() for strict callback checking
CoreMacros: removed placeholder for n:href
MacroSet: 'begin' & 'end' callbacks are optional; fixed calling correct callbacks [Closes #17]
Fixed error message for unknown n:macro [Closes #14][Closes #15]
Parser: fixed parsing {macro|modifier /} [Closes #13]
Template::init() switches Filters to correct XHTML/HTML mode
Merge remote-tracking branch 'upstream/master'