Delayed loading of gallery data

And async fetching of image information (tagging, audio etc)
Merge branch 'master' into bug_2269_slow_gallery

Conflicts:
	app/src/org/witness/informacam/app/HomeActivity.java
Share dialog UI fix
Fixes for history list
Merge pull request #19 from mikaelvonpfaler/bug_2269_slow_gallery

Bug 2269 slow gallery
update launcher icon and add art asset
small change to logo and splash graphics
add unlock actionbar icon that triggers logout/shutdown
fixes #2281 merges security menu options
Merge pull request #21 from n8fr8/feature_logout

add unlock actionbar icon that triggers logout/shutdown
updates to latest head
updating to latest core
final update to core for this release
update to 0.1.27 build 27
fixed #2299 layout bug; added actionbar menu option for metadata view
added new metadata simple text view activity
Merge pull request #22 from n8fr8/feature_metaview

Feature metaview
tagging to latest core
updating to build 28
Merge branch 'feature_metaview'