Issue #1243 resolved
The following http://pygments.org/demo/4970377/
Highlights some missing feature in .properties highlighting.
- ! is also seen as a comment character when used as the first non-whitespace character at the start of a line.
- Space is a valid delimiter between key and value. Note that space can be escaped in the key also key\ with\ space value
- A key can exist with no value set.