Restructures src directory and implements RollUpJS

[ahmadayubi]

Closes #120

Splits the mapml.js file into several files in the following heirarchy:
src
├── mapml
│ ├── handlers
│ │ ├── ContextMenu.js
│ │ └── QueryHandler.js
│ ├── layers
│ │ ├── ControlLayer.js
│ │ ├── FeatureLayer.js
│ │ ├── ImageLayer.js
│ │ ├── MapLayer.js
│ │ ├── StaticTileLayer.js
│ │ ├── TemplatedFeaturesLayer.js
│ │ ├── TemplatedImageLayer.js
│ │ ├── TemplatedLayer.js
│ │ └── TemplatedTileLayer.js
│ ├── utils
│ │ ├── Constants.js
│ │ └── Util.js
│ └── index.js
├── layer.js
├── map-area.js
├── mapml.css
├── mm-mapp.js
└── web-map.js

To build the entire project including mapml.js inside /dist, run the same grunt task as before (grunt / default).

To generate mapml.js only inside of /dist, run grunt / build.
The PR contains 50+ commits that were necessary according to the following link:
Splitting a file while preserving line history