#619 Patch for groovy mode

[Egor Abramovich]

Problem:
Triple quoted strings with HTML markup inside are breaking highlighting.
For example, the following code will be highlighted incorrectly:

def aMultilineString = """
Example
"""
println aMultilineString

Fix:
Triple-quotes literals should be added to "groovy.xml":

<begin>"""</begin>
<end>"""</end>

<begin>'''</begin>
<end>'''</end>

[Egor Abramovich]

Let me put code example again:

def aMultilineString = """
<a href="http://example.com">Example</a>
"""
println aMultilineString

[Jean-Francois LARVOIRE]

I agree with this patch. It's sorely needed!