doc: Add release notes for 0.10.0

Also fix some upgrade notes and update the installation instructions
doc: Delete NEWS file; add link to release notes to README
core: Update copyright year on some visible places
core: Make OTP version check work for OTP 17.0 and up

The initial "R" was dropped, causing the version check to fail:
"R16" > "17"...
doc: Add 0.10 to doc sidebar

(cherry picked from commit 7aed395c75aae6118149027261d76bfab735c181)
core: Bump master branch version to 0.11-dev
Add OS support, change name to Requirements

Update Mac installation notes
Improve docs sidebar layout a bit
Rename 'tutorials' to 'installation'
Tuning docs on services and mod_oauth
build: Also run Travis on 0.10 branch