change heading style and added some headings
added 2 pictures
added image files (forgot them)
completed installation manual
changed image positions / fixed markdown issues
added toc
deleted 'Description' heading (should be obvious), added toc for README.md
Merge remote-tracking branch 'upstream/mozilla_sync_1.2'
added marks to pictures, added info about initial account creation
Merge pull request #1 from RoboMod/master

Merge master changes into mozilla_sync_1.2 branch
Merge pull request #35 from RoboMod/mozilla_sync_1.2

Make initial setup more understandable

Fixes issue #28.