Remove welcome project duplicate fix

Clean up welcomeProjectsFixed code - Issue #2823
Add placeholder menu when running native menu unit tests.
Bumped up project panel secondary text contrast.
Desaturated project-panel-text-2 color based on peterflynn's feedback.
Merge branch 'master' of https://github.com/adobe/brackets into larz/project-panel-text-contrast
Merge branch 'larz/project-panel-text-contrast' of https://github.com/adobe/brackets into larz/project-panel-text-contrast
Dismiss hints when shift plus up arrow or down arrow is pressed
use test window to watch for event loop, use test window jquery
change quick open unit test to wait for editor resize. remove extraneous focusEditor in quick open (handled by ModalBar)
Keyboard shortcut for open folder
updated czech translation

updated all strings based on sprint 25. also translated hardcoded strings.
Updated bootstrap to 2.3.1 and less to 1.3.3 (needed for bootstrap)
Fixed Context Menu
Three more migration fixes
Fixed a few UI issues and removed unused responsive files
Fixed missed log statement
Fix scroller-shadow
Fix install extensions unit tests
Fixed find and JSLint UI
Fixed modal layout issues