+ added some skills and mobs to default book.

Just a sketch of data format to use in real app. Is a subject of change.
* added some exceptions for file reading.
+ added not-used skill that requires unlock.
- modified events system description & added hp for dragon
* only single event on room transition.
+ added a skeleton for events dispatching.
* restored "exceptional" file reading & some work on events
* removed dragon after "sneaking" battle
* fixed compilation after blind commits
+ added argv to skip savedata loading
* fixed room leaving
+ added skills check implementation
Merge pull request #6 from zilraen/dev

Dev