Add 'deploy on android' section in documentation.

This section tries to describe how to deploy apks packaged with Crosswalk
to app store for both IA and ARM architectures.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1240
Merge pull request #101 from yongsheng/fix1240

Add 'deploy on android' section in documentation.
Crosswalk Android packages are not arch-specific
Remove links to Tizen 2 downloads
Don't summarise app running steps in build instructions

This is just another place which has to be maintained if
anything changes, so just refer to the generic instructions
instead.
Update "Getting started" for latest Tizen install method
Update instructions to use VMware instead of Tizen SDK

The best way to run very recent Tizen IVI images is with VMware
Player, so modify instructions to explain that instead of
using Tizen SDK.
Expand list of Tizen IVI dev environments
Update Tizen extensions instructions to use gbs and VMware Workstation