Merge pull request #77 from googleads/master

Add HourOfDay field to Account/Campaign/AdGroup Performance Reports
Add First Page CPC & Top of Page CPC into KEYWORDS_PERFORMANCE_REPORT (issue #88)
Merge branch 'zhuoc-dev' of https://github.com/googleads/aw-reporting into zhuoc-dev
Merge pull request #89 from googleads/zhuoc-dev

Fix issue #88: Add First Page CPC & Top of Page CPC into KEYWORDS_PERFORMANCE_REPORT