v1.2.0

Added isBreakpointUp() method for testing Bootstrap visibility of breakpoints, cascading upwards as Bootstrap does.

Public methods added:

• $.isXsUp()
• $.isSmUp()
• $.isMdUp()
• $.isLgUp()
• $.isXlUp()

Thanks to @howardcox for the PR!

v1.1.0

Updated Bootstrap classes verification to match the new syntax, thanks to @iflorespaz for the PR and report.