Added export as XML and JSON buttons for #508 #1324 #507 #210
using fielddb-glosser from bower in the prototype too fixes #1717
fixes #1718 and fixes #1719 and adding JSON and XML export

for #508 #1324 #507 #210 and formatting
spreadsheet and backbone both have same lexicon sorter (which is in the glosser in later releases, but missing from v1.82)

for #1717 #1663 #1669 #1502 #1607
fixes #1701 clearing old lexicons to makes space

maybe this will help understand why the chuj glosser isnt working in the new release
for #1717 glosser appears to be working as usual with the current map reduces.
adding session fields audio video, images and comments to the export

tested using community georgian and lingllama (linglama has no audio video or images, where as community georgian has multiple audio per datum and images) for #1719
added datalist export for json and xml for #1718 and #1719
jshint
Merge pull request #1720 from cesine/master

Prototype release v2.30 and spreadsheet v2.30