Merge pull request #8 from Dragon-Wonder/dev

Update Master to v1.4.0-R
## [1.4.0-R] - 2018-03-27
### Added
* Toolbar with different tools including: drag, fire, drop, rope, delete, and info. (Issue #5)
* Currently finished tools: fire, drag, drop, delete, and info. (Rope tool is present, but rope equations need more work, so I disabled it for now).
* SDL Licenses.
* Credits to Docs.
* More Doxygen stuff.
* Debug message that prints ball mass when created. 
* Ability to pause the simulation.
* Changable Ratio of meters to Pixels (default is 10 pixels/meter)

### Changed
* Moved Docs to Doc folder.
* Moved various items out of main.cpp into core.cpp to avoid main becoming too large.
* How balls are updated (order and a few equations) to make it hopefully more realistic. 
* Increased ball size from 10x10 pixels to 25x25 pixels.
* Various code improvements.
* Disabled rope tool, still need to work on some of the equations. (Issue #4)
* Reduced kVelocityScalar from 1 -> 0.1
* Floors to casts (due to large number of calls of the floor functions).

### Removed 
* Interia/engergy from spins, because it did nothing.

### Fixed
* Bug of balls getting stuck in walls.
* Bug of balls velocity becoming NaN. (Issue #3)

Author: GamerMan7799

.gitignore

@@ -91,3 +91,4 @@ _start-cmd.bat
 
 #Doxygen Stuff
 /html/
+/project/gh-pages/