Add FlashDevelop and executables to Actionscript

- FlashDevelop uses different file and folder names for it's bin and obj outputs, so those have been added for convenience of devs using that.
- Added a list of some executables that are output by various ways of compiling Actionscript (such as AIR and general Flash).

Actionscript.gitignore

 bin/
 bin-debug/
 bin-release/
+[Oo]bj/ # FlashDevelop obj
+[Bb]in/ # FlashDevelop bin
 
 # Other files and folders
 .settings/
 
+# Executables
+*.swf
+*.air
+*.ipa
+*.apk
+
 # Project files, i.e. `.project`, `.actionScriptProperties` and `.flexProperties`
 # should NOT be excluded as they contain compiler settings and other important
 # information for Eclipse / Flash Builder.