fixes #3984 - use __ instead of _ for i18n to avoid conflict with underscore.js

Fixes #3811 updating to bootstrap 3

fixes #3486 - Make sure loading text is removed when chart data appears.

fixes #2665 - search on click in dashboard pie chart

fixes #2420 - extract strings for i18n from JavaScript, various i18n fixes

flot charts

Use flot charts instead of highcharts.
flot charts license is more friendly.

This version of the code is feature compatible with the old charts,
including:
pie: drill-down and expend.
stacked charts: zoom, hide series in legend.
all types has tooltips....

upgrade foreman to rails 3.2.13

This commit updates from rails 3.0.x to 3.2.x, main changes include:

• Asset pipline support
• cleanup of existing assets (javascript, css, images)

Users who uses foreman in production, make sure that you now compile
your assets, e.g...