Added global_vars option support to TMPL_VAR and TMPL_IF.
Added the global_vars option support to TMPL_LOOP.
Updated TODO.
Renamed case_insensitive option to ph_case_sensitive.

To distinguish it from HTML::Template case_sensitive option.
Fixed a bug with global_vars option processing in TMPL_IF.
Fixed a bug with a string trailing part disappearing on the end of a template processing.
Added the loop_context_vars option support to TMPL_LOOP.

Look ex3.html for the example.
Added TMPL_UNLESS construct.

The TMPL_IF handlers are used to process TMPL_UNLESS.