More snippets for go-mode. Removed some verbosity in old snippets.
Typos fixed. Keys for group declarations now are same as for single declarations.
New line added for printf output in go-mode.
Bugfixes in snippets for golang. Related to pull request #43.
Merge pull request #43 from grafov/master

More snippets for go-mode. Removed some verbosity in text of old snippets.