Explicitly pin dependencies versions

- Pin dependencies versions as this version may not work with older
  versions of these dependencies.
Merge pull request #2 from zotya/master

On saving a chart, copy the generic chart image in the visualization
Possibility to customize Exhibit visualizations title
Refs #9558 - Fix tabular view columns labels

- Fix tabular view to get column labels from FacetsVocabulary and not
  directly from annotations
[fix #2] add namespaces
Merge pull request #3 from simahawk/fix-namespaces

[fix #2] add namespaces
Fix xmlns:ex namespace
Disable jslint for third-party libs.
update changelog
Prepare eea.exhibit 6.2.
Updated version for eea.exhibit to 6.3-dev
Normalizing buildout (Refs #9567)
Refs 13807 - Add exhibit 3.0.0 lib
Refs #13807 - Update exhibit 3.0 JS lib
Refs #13807 - Update to exhibit 3.0 API; jslint
Refs #13807 - Fix timeline extension
Refs #13807 - Update exhibit views advanced properties
Refs #13807 - Include timeline js files from internal servers

- Don't load timeline lib from simile-widgets.com
Refs #13807 - Fix Tabular and Map View

- Fix Tabular details button
- Fix Map bubble height
- Update HISTORY.txt and version.txt
Refs #10176 - Center timeline to current date