Update json.xq

Add a function for simplifying annotating existing XML with json:literal="true" before converting to JSON.
Add startup timeout for wrapper ; gives eXist-db more time to get really started
[bugfix] Check for free disk space in BrokerPool should respect configuration parameter, so one can disable it if necessary.
Merge pull request #268 from dizzzz/service-wrapper-update

Add startup timeout for wrapper.
Merge branch 'develop' of https://github.com/eXist-db/exist into develop
Merge pull request #269 from wolfgangmm/develop

[bugfix] Check for free disk space in BrokerPool
[bugfix] Wrong timeout check: login tokens timed out immedately. They should remain valid for a few seconds or the user gets logged out too quickly if requests come in with a delay.
Merge pull request #271 from wolfgangmm/develop

[bugfix] Wrong timeout check: login tokens timed out immedately.
Make use of git.commit (instead of svn-revision) together with project.version and use current year for copyright in InteractiveClient.
Merge pull request #272 from ljo/develop

Make use of git.commit (instead of svn-revision) together with project.v...
[performance] Skip unnecessary type checks: arguments to optimised functions should not be wrapped into useless, additional type checks, which cause a massive performance loss. All functions overwriting Function.setArguments handle type checks themselves.

In the concrete example which led to this change, calling ngram:contains took several seconds, which came down to a few milliseconds after the fix.
Merge pull request #273 from wolfgangmm/develop

[performance] Skip unnecessary type checks
[performance] ngram index: method for computing string offsets by unicode code points turned out to be a major bottleneck. Replacing the code to avoid String.offsetByCodePoints improves indexing performance by at least factor 2.
Merge pull request #275 from wolfgangmm/develop

[performance] ngram index: method for computing string offsets
Fixing URLs to configuration and documentation in conf.xml.tmpl.
Merge pull request #276 from ljo/develop

Fixing URLs to configuration and documentation in conf.xml.tmpl.
Merge pull request #277 from gspringtech/develop

Additions to expath zip module
[doc] Added javadoc about Element serialization
Merge pull request #280 from adamretter/develop

[doc] Added javadoc about Element serialization
Adding more unversioned or changed by build files to .gitignore. Sorting entries alphabetically.