Merge pull request #497 from deshipu/master

Speed up the display of loadbalancers.
Merge pull request #498 from deshipu/splunk

Splunk column in the ventures report
User preference mechanism and custom user home page
Merge branch 'master' of git://github.com/allegro/ralph into user_preferences
i18n
PEP8
Better user redirecting to home page method
Move VhostRedirectView to better place
Merge pull request #499 from quamilek/user_preferences

User preferences - home page
Merge pull request #500 from deshipu/splunk

Fixes for DHCP config generation
discovery - better HITACHI disks detection
Improved detection on some Nortel switches
Generator.
Get an instance of a logger - correct way; Unused imports removed;
Simplified expression
Merge pull request #504 from vi4m/nortel

Improved detection on some Nortel switches
Merge pull request #505 from andrzej-jankowski/dev

Get an instance of a logger - correct way...
Merge pull request #502 from andrzej-jankowski/master

DISCOVERY - better HITACHI disks detection
Add default value to the role properties
Delete the property value if it has the default value