Update readme and changelog files for Dec release (#360)

* Stage changes

* Update changelog with additional bug details

CHANGELOG.md

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+# Change Log
+
+## Version 0.24.1
+* Release date: December 19, 2017
+* Release status: Public Preview
+
+## What's new in this version
+* Azure Integration with Create Firewall Rule
+* Windows Setup, Linux DEB and Linux RPM installation packages
+* Manage Dashboard visual layout editor
+* Script As Alter and Script As Execute commands
+* Integrate VS Code 1.18.1 editor platform
+* Enable Sideloading of VSIX Extension files
+* Support "GO N" batch iteration syntax
+* "Run Current Query with Actual Plan" command
+* Delete Recent Connection command in Connection Dialog
+* Performance fixes for Object Explorer expansion and Scripting sprocs
+* Fix IntelliSense settings namespace to be `mssql.*`
+* Only show `Disconnect` menu item if server is connected
+* Several snippet and default widget improvements
+* Improve Kerberos connection failure error message
+* Add command to hide query results window after running query
+* Retain cursor line positon when switching document tabs
+* Keep cursor focus in editor window after executing query
+* Support shortcuts to execute common queries like sp_who or sp_help
+* Fix tab order behavior when using keyboard to navigate dialog controls
+* Improved chart axis and label behavior
+* Allow expanding databases not in certain non-Online states
+* Connection Dialog selects most common default authentication method based on platform
+
+## Contributions and "thank you"
+We would like to thank all our users who raised issues, and in particular the following users who helped contribute fixes:
+* mwiedemeyer for `Fix #58: Default sort order for DB size widget (#111)`
+* AlexTroshkin for `Show disconnect in context menu only when connectionProfile connected (#150)`
+* AlexTroshkin for `Fix #138: Invalid syntax color highlighting (identity not highlighting) (#140))`
+* stebet for `Fix #153: Fixing sql snippets that failed on a DB with case-sensitive collation. (#152)`
+* SebastianPfliegel `Remove sqlExtensionHelp (#312)`
+* olljanat for `Implemented npm version check (#314)`