Added some extra map making information regarding timer coefficience and AI orders for single player
Merge pull request #49 from craigbrett17/master

More map making documentation
now a direct hit will inflict at least "minimal_damage" hit points.

Defined in rules.txt ("parameters"). The default value is 0.17.
Closes #33.
Merge branch 'master' into feature-build-limit
Made check_build_limit take into account orders of player units

Also moved it to ComplexOrder rather than ProductionOrder so BuildOrder could inherit the method