Bumping version of minecraft to install

I'd recommend bumping the version of this cookbook when merged based on the [1.7.7 release notes](https://mojang.com/2014/04/minecraft-1-7-6/):

Unfortunately the 1.7.6 and newer versions are not compatible with 1.7.5 (or earlier) servers. Please update your servers to 1.7.7, this is also an important step to prepare them for the upcoming 1.8 release. Servers should automatically update all player profiles to the new format, but please make sure that you are in the correct server mode (online mode/offline mode) when you start the 1.7.7 server for the first time, because profiles are not compatible between these two server modes.

Because this is important, let me repeat that last sentence:
Please make sure that you are in the correct server mode (online mode/offline mode) when you start the 1.7.7 server for the first time, because profiles are not compatible between these two server modes.