Add 5.7.0 release info

Author: lefticus

_posts/2015-05-07-release-5.7.0.markdown

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+---
+title: Release 5.6.0
+tags: release
+---
+## [Release 5.7.0](https://github.com/ChaiScript/ChaiScript/releases/tag/v5.7.0 "Release 5.7.0")
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+
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+### Changes since 5.6.0
+* Significant code cleanups and reduction
+* Smaller builds
+* Faster compiles
+* Less runtime memory usage
+* ~2x faster runtimes
+* biicode support
+* method_missing feature added #164 @arBmind
+* Generic objects with dynamic properties support
+* Add ability to call functions contained in properties
+* Add lambda captures
+* Create cheatsheet.md for all-in-one reference of features
+* Fix support for libc++
+* Eliminate clone of return value stored locally
+* Eliminate 'return' statements when last line of function
+* Reduce number of runtime exceptions occuring
+* Reduce copies / moves of return values.
+* make use statement return value of last statement in file
+* Add ability to access fixed array sizes
+* Add support for scientific notation floating point literals #174 @totalgee
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