#94986: Added proj4js to bower so we are able of transforming geometries (needed for the buffering solution for showing the area around stations, as the buffering operations only work ok on cartersian coordinates, and to have that we need to project the lat/lngs).
#94986: added support for handling min max and step values specified in the slider directive as attributes.
#94986: changes due modifications in angularSlider.js.
#94986: added CanvasLayer from https://code.google.com/p/google-maps-utility-library-v3/source/browse/#svn%2Ftrunk%2Fcanvaslayer for the canvas approach to showing areas around stations.
#94986: modifications of the loading indicator previously added by @moiarcsan
#94986: added proj4js and CanvasLayer libraries.
#94985: Added timers to the filter architecture.
#94985: improvements to filtering architecture so we prevent the erroneous removal of features that arent there and calling the clearing callback if not desired.
#94984: Improvements to checkbox styles.
#94986: Implemented buffer (using jsts and proj4 to avoid deformation) and canvas based approachs to the showing of walking areas around stations. The buffer solution is good in time terms, but it sometimes fail to include areas around some points in the buffer so its erroneous. The canvas based approach is the best developed so far, with drawing times in the range of 1~2 ms.
#94984: Updates to appengine (to require security) and gitignore files.
Merge pull request #44 from luisromangz/94986-BufferAndCanvasApproachesToRepresentingAreasAroundStations

#94986 buffer and canvas approaches to representing areas around stations