Updated version number to 3.3.1-SNAPSHOT. Fixed moment.js urls in some examples. Fixed position issue with close button of the Network manipulation menu
cleaned up the setSize function
cleaned up docs for network, added fontfill for nodes
updated history
type in docs
Update network/node image code to allow for specifying a broken image url to use when a node image fails to load
Updated network.html documentation to include brokenImage property
Merge pull request #278 from sfairgrieve/develop

[Network] Added support for a broken image fallback when node image fails to load
updated gitignore
Refactored data manipulation connect handling
Updated history
Fixed #279: `className` of groups not being updated when changed
Merge pull request #281 from Gregoor/master

Refactored data manipulation connect handling
Merge branch 'master' into develop
Updated dist folder
Fixed #284: Fixed the `id` field of a new item not correctly generated.
Fixed #286: newly added item ignored when returning an other object instance.
Fixed #148: option `autoResize` not working on IE in case of changing visibility of the Timeline container element
Store additional item fields as data- attributes

If additional item fields are defined on the DataSet or array being
passed to the timeline, store them as data- attributes on the content
element.
Define allowed dataAttributes as Timeline option

Read from an array of allowed dataAttributes at the timeline level and
write them as data- attributes on the item