Fix JSHint warnings:

modules/ext.vector.collapsibleNav.js: line 5, col 17, Strings must use singlequote.

modules/ext.vector.expandableSearch.js: line 5, col 1, Trailing whitespace.
modules/ext.vector.expandableSearch.js: line 30, col 1, Trailing whitespace.
modules/ext.vector.expandableSearch.js: line 32, col 28, Trailing whitespace.
modules/ext.vector.expandableSearch.js: line 33, col 45, 'context' is defined but never used.
modules/ext.vector.expandableSearch.js: line 44, col 47, 'context' is defined but never used.
modules/ext.vector.expandableSearch.js: line 55, col 44, 'context' is defined but never used.
modules/ext.vector.expandableSearch.js: line 61, col 46, 'context' is defined but never used.

modules/ext.vector.footerCleanup.js: line 22, col 20, 'mw' is not defined.
modules/ext.vector.footerCleanup.js: line 28, col 20, 'mw' is not defined.

modules/ext.vector.sectionEditLinks.js: line 7, col 5, Too many var statements.
modules/ext.vector.sectionEditLinks.js: line 8, col 5, Too many var statements.
modules/ext.vector.sectionEditLinks.js: line 13, col 9, Too many var statements.
modules/ext.vector.sectionEditLinks.js: line 14, col 9, Too many var statements.
modules/ext.vector.sectionEditLinks.js: line 15, col 68, Expected '!==' and instead saw '!='.
modules/ext.vector.sectionEditLinks.js: line 22, col 13, Too many var statements.
modules/ext.vector.sectionEditLinks.js: line 41, col 17, Expected '===' and instead saw '=='.

modules/jquery.collapsibleTabs.js: line 125, col 25, Bad line breaking before '&&'.
modules/jquery.collapsibleTabs.js: line 137, col 17, Too many var statements.
modules/jquery.collapsibleTabs.js: line 141, col 17, Too many var statements.
modules/jquery.collapsibleTabs.js: line 148, col 17, Too many var statements.
modules/jquery.collapsibleTabs.js: line 162, col 29, Too many var statements.
modules/jquery.collapsibleTabs.js: line 172, col 17, Too many var statements.
modules/jquery.collapsibleTabs.js: line 176, col 17, Too many var statements.
modules/jquery.collapsibleTabs.js: line 183, col 17, Too many var statements.
modules/jquery.collapsibleTabs.js: line 184, col 17, Too many var statements.
modules/jquery.collapsibleTabs.js: line 195, col 29, Too many var statements.
modules/jquery.collapsibleTabs.js: line 49, col 23, '$tabsArray' is defined but never used.

Change-Id: I17c258c1505a049a6d33e7708a6638f1b5590ad2