Added basic command completion

In order to finish up the tab completion, a few commands will need to be
added in order to allow for context-dependent completion.

For example, when the user types `minecraft_server stop [TAB]`, they
should only be provided with worlds that are currently running.  The
same goes with enabling/disabling worlds, etc.
Changed formatting of command completion file

Variable names are now capitals, removed curly brackets around
variables, and removed unused local base.
Merge branch 'master' of https://github.com/Shamus03/MinecraftServerControlScript into completion
Move and rename the completion script
completion - Fix the location of the init.d script
Default to the OPTS list only on the first COMP_CWORD
Completion - Fix the options