Merge pull request #19 from FenixXx/master

Fix issue #17 - adapt to new g_gear behavior in UrT 4.2
[4.2][!gear] accept weapon group as command parameter

With all the weapons that are available, it can be cumbersome to disable all automatic weapons. Then one starts to miss the _4.1 like_ weapon groups.

Introduce the following weapon groups:
 - all_nades
 - all_snipers
 - all_pistols
 - all_auto
Update README.rst

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