Project: use scala 2.10.4.
Build: remove the redundant comment.
PetPlugin: rename the database script. Close #97.
MarkovUser: getting the network synchronously.
PetPlugin: Basic support for petcoins.
Merge pull request #114 from rexim/petcoins

PetPlugin: Basic support for petcoins.
PersistentStore: pass storages into constructor. Close #46.
PetPlugin: store petcoins in a database. Close #115.
Fixes #119. Implemented pet proposals.
Merge pull request #120 from rexim/issue-119

Fixes #119. Implemented pet proposals.
PetPlugin: fixed some stupid mistakes in implementation of #119.
Merge pull request #121 from rexim/proposal-implementation-mistakes-fix

PetPlugin: fixed some stupid mistakes in implementation of #119
PetPlugin: pet transfer command. Close #118.
PetPlugin: update help.
PetPlugin: fix database structure.
PetPlugin: fix sign.
PetPlugin: standartize command processing.
PetPlugin: add rating command. Close #123.
PetPlugin: changing the nick now costs 1PTC.
MarkovPlugin: fix negative or zero argument for say command. Close #100.