Minor: object specific message if path blocker

* Console placeholder object
Add spaceships

* Press "F" to switch into a spaceship mode. Right now - one ship per
player.
* Separate lib/ into "player" and "ship": player - humans on foot,
ship - space ships flying around.

Commit references #1.
Spaceships now have rotating target around them

* Target will be used to determine movement and fire direction.
* Hit "h" or "l" to rotate the target.

Commit references #1.
Add acceleration

* Hit "k" to accelerate, "j" to decelerate.

Minor:
* Add some stars to the space map.

Commit references #1.
Minor: all classes inherit from object
Space flight: now in 5 dimensions!

* Add 5D-space handling (player level interaction still utilizes 3
dimensions, which is an intended behaviour).
* Will need to spend quite some time refactoring after the milestone is
complete.

Commit references #1.
Minor: parent for player/ship Level class, PEP-8

Commit references #1.
Generate new space chunk when needed (infinite)

Commit closes #1.
Merge branch 'space-travel' into develop
Add license file (GPL v2)
Use doctest and unittest for writing tests

Commit closes #4.
Shooting projectiles in space

* Projectiles are shot by hitting "f".
* Projectiles have certain life span (path length) and movement
speed.
* Does not affect other ships yet.
* Add test for projectile class.

Commit references #2.
Major refactoring for TDD: modules

* Rename player and ship types to interior and exterior respectfully.
* All non-UI related modules have unit tests (small exceptions will be
dealt with).
* Game is more object driven.
Complete major TDD refactoring
Minor: python code PEP8 compliance
Minor bugfix: "say" behaviour returned to normal
Spaceships can be blown up now

* However, need separate spaceships/players for feature to work.

Commit references #2.
Interiors are assigned to spaceships now

* All spaceships have their own interior.
* Player has to set desired spaceship name via config.ini.

Commit references #8.
Spaceship is piloted by activating console

* To enter flight mode - activate navigation console. To exit - press
"F" key. Ship will continue moving when you exit.

Commit closes #8.
Spaceships can not be piloted after crash

* Need more graceful death in the future, though.

Commit closes #2.