Fixed the range of valid decimal values

The minimum (ie. most negative) value of a Java `double` data type
equals -Double#MAX_VALUE.

http://stackoverflow.com/questions/5411637/bigdecimal-check-value-is-within-double-range
Improved the marshalling of XSD 'integer' and 'decimal' values
Disconnected from Sun proprietary API
[maven-release-plugin] prepare release 1.1.7
[maven-release-plugin] prepare for next development iteration
Updated version information