Features

#268 Add search in the front page of flagr UI. Thanks to @yosyad

Bug Fixes

#273 Fix undefined flag id in the UI when the flag is deleted. Thanks again to @yosyad
#275 Fix float equality comparison problem. Previously, the epsilon is set as 1e-6 for relative difference, now, we check 1e-6 for absolute difference first, and then the relative difference.