Added scrypt_tests from 1.6
Merge pull request #486 from patricklodder/1.7-dev-scrypt-test

Added scrypt_tests from 1.6
Shiny, retina ready OS X icon file
Fix doubled alerts in alert tests causing them to fail
Merge pull request #487 from langerhans/1.7-dev-alerttest

Fix doubled alerts in alert tests causing them to fail
fixed subsidy limit test
fix documentation of block reward schedule

there was an off-by-one error in the documentation
Merge pull request #490 from leofidus/1.7-subsidy-limit-test

fixed subsidy limit unittest
Disable payment protocol pending further assessment and potential rework.
Replaced tabs with spaces.
Merge pull request #491 from rnicoll/1.7-dev-no-payment

Disable payment protocol pending further assessment and potential rework
Inserted checkpoints through the 100k-200k block range, with emphasis on the 145k
(hard fork) and 200k (second reward halving) blocks.
Corrected timestamp on most recent checkpoint block; previous epoch value was incorrect
when calculating timestamp.
Merge pull request #492 from rnicoll/1.7-checkpoint

Add 100k-200k checkpoints
Renamed release notes to remove reference to alpha.
Marked build as production read and removed beta tag in preparation for RC release.
Merge pull request #493 from rnicoll/1.7-dev-rc

Prepare development branch for release candidate
refactor GetMinFee to remove dead code
don't send feeless transactions
add travis check for disable-wallet compile mode