Merge pull request #211 from virtual-world-framework/mars-game-staging

Mars game staging
Adding the full mix files for the gameplay music.
- Switch to the non-layered music for the main game
- Don't load a bunch of sounds that we're not using anyway
- remove redundant initialVolume parameters.
Merge pull request #215 from virtual-world-framework/game-music-full-mix

Game music full mix
Enables parenthesis evaluation.

Conflicts:
	source/blocks.js
Fixed parentheses multiplication/blank issues.
Fixes double negative issue.

Conflicts:
	source/blocks.js
Small fix to a rebase incorrect edit.
Fixes more issues caused when rebasing
More equation handling changes made.
Fixes issue when x proceeds a number and assigns multiplication operator.
Changed + and - returns to strings.
Final fixes
Merge pull request #218 from virtual-world-framework/graph-parentheses

Enables parenthesis evaluation
Merge pull request #222 from virtual-world-framework/mars-game-staging

Mars game staging
Add longer delays for some of the scenario 2 VO.
Merge pull request #224 from virtual-world-framework/sound-VO-delay

Sound vo delay
Adds in the ability to clear blockly blocks via a trigger action.
Merge pull request #225 from virtual-world-framework/clear-blockly

Clear blockly blocks via trigger