Replace bower with npm

[coni2k]

Lately there are two issues with bower package installations:

1. When '^' used, it's retrieving latest major package, instead of minor.
2. During initial setup, VS could get npm packages but not bower packages (due to firewall settings?), which makes it difficult to install the project on a new computer.

Having two package managers for front-end is already redundant, so if all packages are okay, remove bower and move its packages to npm.

[coni2k]

This is okay.

Only datajs v1.1.3 was downgraded to v1.0.3, but it didn't create any issue as far as it has been tested.
Otherwise find a copy of v1.1.3 and store it in /lib folder.