feat(timepicker): added new relative time option , will set time range to midnight to now, closes #1186

Conflicts:
	public/css/less/gfbox.less
	public/emails/reset_password.html
	public/emails/welcome_on_signup.html

feat(invite): lots of work completing the new email template system and css inlineing, converted new_user_invite.html to new system, #2353

Merge branch 'influxdb_alias_columns' of https://github.com/thuck/grafana into thuck-influxdb_alias_columns

fix(graphite): Fix for bug when using series ref (#A-Z) and referenced series is hidden in query editor. fixes #2484

With this patch it's possible to use the column name as an identifier.
This can help when we have multiple columns as it would be possible to automatic generate a legend.
Also this would help in future when grafana could support the "AS" in the query builder.

Including more special options for fill

Included "previous" and "none" as possible values for fill.
From the influxdb documentation:
 - "previous" means the values of the previous window is used.
 - "none" means that all null values are removed.

Change log file permissions from 0660 to 0644

Depending of the value a different set of operators will show up.
If regex only =~ and !~ will show up.
Any other value will show =, <>, <, >.

This should fix the case from when we migrate from a version that doesn't contain tag.operator.

This patch includes some missing comparators/operators for influxdb:
>  - greater than
<  - less than
<> - not equal
!~ - doesn't match against

It includes the tag.operator fields to facilitate identification of the operators on the segments.
It keeps the logic for the regex syntax; although it changes the way to validate it, to handle the new operators use case.

Including non_negative_derivative function on influxdb