Match namespaced defs as mako tags

e.g. <%self:foo></%self:foo>
Add mako syntax groups to htmlPreproc

for greatly improved highlighting (see :help html.vim)
Set 'current_syntax' to 'html'

it makes more sense than 'eruby' and works fine
with the htmlpreproc cluster
Update version and last-change date
Merge pull request #2 from rwstauner/htmlpreproc

Use htmlPreProc cluster for improved syntax highlighting

Thanks rwstauner for the updates.