PARTIAL Adding Show/Hide Tabs and Spaces to View menu
fixing notification
Merge remote-tracking branch 'upstream/master'

Conflicts:
	ninja_ide/gui/notification.py
Merge pull request #1549 from diegosarmentero/master

fixing notification
some improves and adding selector feature
selector key navigation added
show start page if available on last file closed
Merge pull request #1550 from diegosarmentero/master

Several fixes and adding Selector Feature
fixing refresh screenshot bug
Merge pull request #1551 from diegosarmentero/master

fixing refresh screenshot bug
speed up selector animation
Merge pull request #1552 from diegosarmentero/master

speed up selector animation
start page code improved for different sizes
Merge pull request #1553 from diegosarmentero/master

start page code improved for different sizes
couple of bugs fixed
Merge pull request #1554 from diegosarmentero/master

couple of bugs fixed
remove object from toolbar
Merge pull request #1555 from diegosarmentero/master

remove object from toolbar
some improves in qml buttons and new file in start page
Merge pull request #1556 from diegosarmentero/master

some improves in qml buttons and new file in start page