Install sound file on unix
for #542
g_file requires gio
beep sound is gtk only
add paplay
Use more useful example for url handler
typo
Change most Comment lines to be GenericName. GenericName should be
used when only one IRC client in installed.

	modified:   share/misc/hexchat.desktop
Change "no" to "nb" for Norsk Bokmål. In norway there is not only
one official language but two.

	modified:   share/misc/hexchat.desktop
Translate Comment in french, german, italian and norwegian bokmål

	modified:   share/misc/hexchat.desktop
Add GTK and IRCClient to Categories. This is Based on:

http://standards.freedesktop.org/menu-spec/latest

	modified:   share/misc/hexchat.desktop
Fix a typo.

	modified:   share/misc/hexchat.desktop
Add english generic name
In do_an_re() put WORD_CHANNEL before WORD_HOST.  fixes #440
Build with travis
fix install error
Merge pull request #550 from RichardHitt/issue440a

In do_an_re() put WORD_CHANNEL before WORD_HOST.  fixes #440
Fall back to global username for sasl
Fix Ubuntu build warnings by using gcc flag -Wno-unused-result
Merge pull request #556 from RichardHitt/ignore-unused

Fix Ubuntu build warnings by using gcc flag -Wno-unused-result