Merge pull request #14 from ONLYOFFICE/master

Back merge

CHANGELOG.md

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+# Change log
+
+## 4.2.1
+### New Features
+#### All Editors
+* Ability to set dash type for shapes
+* Redesigned embedded viewers
+* Better support of HiDPI systems
+* Update bootstrap to 3.3.7
+
+#### Document Editor
+* Ability to open and edit Footnotes
+* Ability to insert number of pages in document
+* Redone Version History. Ability to hide minor features.
+
+#### Spreadsheet Editor
+* Add ability to insert Equations in Spreadsheet Editor
+* Ability to open and edit Sparklines
+* Add new formula `SUMIFS`
+* Ability to select data from drop-down menu in context menu
+* Add multiselect support
+* Add rotation of 3D Charts
+* Update and improve visual styles for all chart types
+* Bring back `Freeze Panes` in `View Settings` menu
+* New algorithm for calculating cell height
+
+#### Presentation Editor
+* Add ability to insert Equations in Presentation Editor
+
+### Fixes
+#### Document Editor
+* Fix broken `Insert number of page` button
+* Fix problem with duplicate of last hieroglyph
+* Fix problem with changing chart type from 2D to 3D
+
+#### Spreadsheet Editor
+* Fix problem with empty cell while changing sparklines
+
+#### x2t
+* Improve compatibility with `doc` format