make rudimentary Examples layout: both actions on ExamlesController render the same view

currently rather slow; need to switch to remote data source in this
dataTable
add UserVoice widget
add logo, add favicon, add some images, remove UserVoice :(
fix width and alignment in navbar; fix responsive CSS with top padding on body
add contributor photos; fix navbar CSS and People CSS
add Feedback mailto: link
add HTTP basic auth
change Gemfile: remove pg, add thin
update aspect ratio of some photos
change HTTP auth method; set  production.sqlite3 as temporary production DB
precompile all assets for production

See [Asset pipeline](http://guides.rubyonrails.org/asset_pipeline.html)
temporary fix to use Rails as the asset server

this is NOT recommended for production! TODO change it: the Web server
should serve the precompiled assets.
fix error in email link
add production sqliteDB (gzipped)
add Phusion Passenger and MySQL gems

for production environment
prepare database settings and gems for production server
manually change the data type of ID columns
switch to mysql2 gem to fix encoding error
update assets
update assets