Remove #cache directive and cache identifiers.  Closes #21
Merge remote-tracking branch 'origin/master' into remove_cache_statement_21

Conflicts:
	cheetah/Template.py
	cheetah/Tests/SyntaxAndOutput.py
Merge pull request #30 from bukzor/remove_cache_statement_21-buck-merged

Remove cache statement 21 buck merged
Merge pull request #26 from bukzor/remove_cache_statement_21

Remove #cache directive and cache identifiers.  Closes #21