Added comments to Alias.java

Added complete documentation for Alias.java both complete javadoc and
comments
Added comments to AliasCmdExecutor.java

Added complete javadoc comments to AliasCmdExecutor.java but I'm not
familiar with Bukkit specific API so some comments need elaboration,
@todos were placed where needed for this
Added comments to AliasExecutor.java

Added complete javadoc comments to AliasCmdExecutor.java but I'm not
familiar with Bukkit specific API so some comments need elaboration,
@todos were placed where needed for this
Added comments to AliasListener.java

Added complete javadoc comments to AliasListener.java but I'm not
familiar with Bukkit specific API so some comments need elaboration,
@todos were placed where needed for this
Added comments to AliasRunAs.java

Added complete javadoc comments to AliasRunAs.java
Added comments to SudoAlias.java

Added complete javadoc comments to SudoAlias.java but I'm not familiar
with Bukkit specific API so some comments need elaboration,
@todos were placed where needed for this
Added comments to SudoAliasCommandExecutor.java

Added complete javadoc comments to SudoAliasCommandExecutor.java but
I'm not familiar
with Bukkit specific API so some comments need elaboration,
@todos were placed where needed for this
Merge pull request #1 from wiseguy12851/master

Added substantial documentation