Filter on IDs

Users can now filter stories/epics/themes on ID by typing IDs in a
filter textbox contained in the header. This textbox can be
automatically populated if the user selects some items and presses the
new "filter selected" button, also contained in the header. In order to
display to the user what IDs different items have, a small ID text has
been added in the bottom right corner of each element.

The active filter is transferred to the web URL, making it easier to
share a filter with other users by simply copying the link.

To review this change easier, whitespace changes can be ignored by
adding ?w=1 to the URL on any github.com page that is showing a diff.

fixes sonyxperiadev/BacklogTool#25
Small fixes for Filter on IDs

* Fixed indentation in header
* Added some comments for javascript code
* Added tooltip for the ID tags
* Filter now ignores white-spaces

fixes sonyxperiadev/BacklogTool#25
Merge pull request #28 from fredrikpersson/filter

Filter
Fix for incorrectly tabbed code
Changed position of newly created items

New items are now being placed directly after the most recently selected
backlog item instead of being placed at the bottom.

Fixes sonyxperiadev/BacklogTool#23
Removed spaces from some blank lines
Merge pull request #30 from fredrikpersson/create-position

Changed position of newly created items
Fixed week numbers in date picker

Changed week number definition to ISO 8601 which is the following:
"weeks start on a Monday; the first week of the year contains the first
Thursday of the year".
Moved ID tags to the upper left corner

Instead of having ID tags in the bottom right corner of each backlog
item, it is now placed in the upper left corner together with the label
that indicates whether the item is a task, story, epic or theme.
Updated link for screenshots in README

The link became broken when sonyericssondev changed name to
sonyxperiadev.
Merge pull request #34 from fredrikpersson/id-tag

Moved ID tags to the upper left corner
Merge pull request #35 from fredrikpersson/readmelinkfix

Updated link for screenshots in README
Merge pull request #33 from fredrikpersson/weekfix

Fixed week numbers in date picker
Save button

Every backlog item now got an individual save button.
Renamed some old code to story attribute names instead of effort, status and prio.
Work in progress, bugs are there, and my login credentials
Ready for update against master
Rebased, ready for review
Merge branch 'master' of https://github.com/nilsi/BacklogTool

Conflicts:
	src/main/webapp/WEB-INF/views/header.jsp
	src/main/webapp/resources/css/styles.css
	src/main/webapp/resources/js/scripts.js