Release 0.1.10: Language improvements and fixes

The main change in this release is the new pipe operator |, which allows you to set the context node explicitly. The most obvious use case for it is to select a source JSON object to do object matching, but it can be used for many other things, too. Many thanks to @ecerulm for contributing the implementation!

Other changes:

• The parse-url function has been added, designed and implemented by @ecerulm
• A bug in the parsing of escape sequences inside strings was fixed by @biochimia