A few more bitcoin -> dogecoin in build-unix.md

Pretty simple.  Should BITCOIN_ROOT be changed?
Merge pull request #623 from whitj00/patch-2

Replace occurrences of "bitcoin" with "dogecoin" in the UNIX build instructions.
Update bitcoin_zh_CN.ts

Update Chinese translation of 'Dogecoin'
Merge pull request #625 from 51doge/patch-3

Update bitcoin_zh_CN.ts
Change Bitcoin to Dogecoin
Change Bitcoin to Dogecoin
Merge pull request #631 from PartTimeLegend/patch-2

Change Bitcoin to Dogecoin
Merge pull request #630 from PartTimeLegend/patch-1

Change Bitcoin to Dogecoin
New icons with 7 images
Mark as release build
Merge pull request #634 from langerhans/1.8-dev-release

Mark as release build
Merge pull request #635 from langerhans/1.8-dev-icon

New icons with 7 images to ensure Gitian build is deterministic
Change Bitcoin to Dogecoin
Update COPYING
For Bitcoin not Dogecoin
Delete release-notes-0.3.13.md
Delete release-notes-0.3.14.md
Delete release-notes-0.3.15.md
Delete release-notes-0.3.16.md
Delete release-notes-0.3.17.md