Update README.md and gitkeep consistancy

Remove 2 extra lines, and capitilsation of Juju, so the doc is
consitent. 2 empty directories either have .keep or .gitkeep
change .keep to .gitkeep to be consistent

Change-Id: Ib965a7e2a7afcd36423dadf548d33a8efbfaf6fe

README.md

@@ -146,7 +146,7 @@ To use this feature, use the --bind option when deploying the charm:
     juju deploy keystone --bind \
     "public=public-space internal=internal-space admin=admin-space shared-db=internal-space"
 
-Alternatively, these can also be provided as part of a juju native bundle
+Alternatively, these can also be provided as part of a Juju native bundle
 configuration:
 
     keystone:
@@ -187,7 +187,6 @@ Overrides are provided to the charm using a Juju resource called
 `policyd-override`.  The resource is a ZIP file.  This file, say
 `overrides.zip`, is attached to the charm by:
 
-
     juju attach-resource keystone policyd-override=overrides.zip
 
 The policy override is enabled in the charm using:
@@ -275,7 +274,6 @@ automatically from the `token-expiration` and the `fernet-max-active-keys`
 configuration parameters. For example, with an expiration of 24 hours and
 6 active keys, the rotation frequency is calculated as:
 
-
 ```python
 token_expiration = 24   # actually 3600, as it's in seconds
 max_active_keys = 6