Fixing app.yaml plus cosmetic things

Fixing app.yaml as it was previously broken on my local installation,
conf borrowed from SO:

- http://stackoverflow.com/questions/21581182/google-app-engine-wordpress-update-failure

Cosmetic things:
- tabs to spaces
- YOUR_PROJECT_ID more consistent now
addressing further points by johndylan@
Merge pull request #16 from palladius/master

Fixing app.yaml plus cosmetic things
Updated to WordPress 3.9
Removing redundant DB_USER entry
New build - includes WP 3.9 and fix for redundant DB_USER
Update README.md
Update README.md
Use WP 3.9
Reverting to cleaner static file syntax; adding skip_files
Merge pull request #1 from GoogleCloudPlatform/master

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