Support for '=' sign in HTML template tag parser

[dmorissette]

In bug 507, Steve wrote:

Julien: I know this one is marked as resolved but there is another related
problem. You can't have equal signs within a quoted argument (e.g.
proj="init=epsg:xxxx"). Might that be easily fixable? Seems that just about
anything should be allowed within the quotes.

I'm creating a new bug since the original bug was already fixed.

[dmorissette]

Assigned to Julien. If this is too complicated for 4.4 then please move target
milestone to FUTURE.

[jlacroix]

I've started working on this. I'm mostly done. Will commit monday morning.

[jlacroix]

I've commited my changes. The template parser replace '=' by ']' which is an
illegal character in the template parser. So at the time the '=' is replaced,
the string can't contain any ']' and for sure the code that does something with
the ']' is already done.

Marking as FIXED.

[sdlime]

Thanks Julien!