Minor fixes and updates: strip leading and trailing slashes from custom page name in url hash or query string; removed rogue semicolon; added methods to render and retrieve table HTML using XNAT.table(); added usage comment in 'hello.vm'.

New and updated files for custom page support. Put page content files in *templates/pages or in the '/pages' folder at the root of the web app. Velocity, JSP, and HTML files are supported.

Performance improvements to Spawner™ spawn.js and $.spawn.js with new methods - spawn.element() and spawn.plus(); Chainable element generator - XNAT.element().div().p('Content'); Specific methods for individual elements - XNAT.element.tag('Content'); These need more testing before widespread usage.

Fixed URL processing *for real*; fixed 'Save Search' dialog rendering and validation; adjusted width of wrangled tabs; other styling tweaks; tiny change to randomID() output.

XNAT-3910, XNAT-3918, XNAT-4030: MAJOR UI CHANGES! NEW topBar nav menu and user bar; many, many tweaks to styling; removed a bunch of <table> elements that were used for layout; tweaked CSS to account for that; updates to 3rd-party JavaScript libraries (but rolled back jQuery to 1.12.0).

integrate gradle-xnat-plugin and work out configuration for Cargo deploy
tasks.