Durr, even more overmap vs. river vs. bridge boundary checking

Dunno if bridges between overmaps should even be legal.
Initialize webs properly in mapgen. Avoids weird bug where fields stop updating if you burn the webs.
Merge branch 'master' of github.com:TheDarklingWolf/Cataclysm-DDA into for-darklingwolf
Moved drugs that were in misc to chem section
Merge branch 'master' of https://github.com/TheDarklingWolf/Cataclysm-DDA
Add bindist files to the .gitignore
Add launcher for Linux/OS X users to double click
Merge pull request #41 from hovatterz/gitignore

Add bindist files to the .gitignore
Merge pull request #42 from hovatterz/launcher

Add launcher for Linux/OS X users to double click
Fix NPC teaching
Merge pull request #43 from hovatterz/teaching

Fix NPC teaching
Remove redundant check for flamable clothing.
Merge branch 'master' of github.com:TheDarklingWolf/Cataclysm-DDA into for-darklingwolf
a bit of an engine mod

to increase variety in car parts. The new 'bigness' property is the
only one that's currently transferrable between car parts & items.
Yeah, there certainly needed to be another 'size' attribute. this one's
variable though, and can mean different things depending on context.
(plating thickness, cc of engine displacement, wheel radius, kilowatts,
etc.)

not ready yet. i just wanted to put what i had out there.
L instead of CC in veh part display

Also taking out long word 'combustion' from part name.
Graffiti.
Updated .cbp
same deal for item types as the prev. commit.

mostly cosmetic. Also updating the struct name
it_veh_part -> it_var_veh_part
Merge remote-tracking branch 'dda/master' into bigness
Testing stuff