Prepare for publishing to Maven Central

* Inherit from org.sonatype.oss:oss-parent:7
* Fixed SCM URLs. The connection URL was invalid, and the 'git' protocol
  is not suitable for the developer connection. I chose to use SSH.
* Using maven-assembly-plugin as the standard way of creating
  distros. Set up resources and removed maven-resources-plugin and
  maven-antrun-plugin configurations.
* Added buildnumber-maven-plugin and enhanced configuration of the
  maven-jar-plugin to get proper build info into the manifest. Since
  this plugin creates a timestamp as well, the other properties for
  timestamps were removed.
* Added property 'project.build.sourceEncoding' in order to set the
  encoding globally.
* Added maven-source-plugin and maven-javadoc-plugin.
* Removed redundancy between plugins and pluginManagement.
* Removed Github downloads plugin.
Add support for G1GC log lines that contain decimal separators.

GCViewer can now handle log lines such as the one below, as produced by JDK
1.7.0_12-ea-b08:
  [Eden: 118.0M(118.0M)->0.0B(112.0M) Survivors: 10.0M->16.0M Heap: 548.6M(640.0M)->440.6M(640.0M)]
merge pull request #54 (deploy to maven central)
add sourceforge file deployment
remove javadoc warnings
bugfix for #64: use isSignificant() for fullGcPause correctly
update contributors information
change compiler version from 1.6 to 1.7
remove "$Id: $"
add new dialogs for README and LICENSE
introduce new LocalisationHelper to replace all access to ResourceBundle
introduce UrlDisplayHelper to handle links to be shown in a browser
fix GCModel#updateHeapSizes() to use derived sizes (will always show numbers for "tenured heap" in memory tab, when "young heap" is shown)
Add support for parsing G1 logs that have decimal values in the log format. 
Add support for parsing G1 logs that use the -XX:+PrintAdaptiveSizePolicy flag
fix an error in how the memory is parsed that was introduced in the initial support for parsing decimal-formatted memory values
Merge remote-tracking branch 'stephan202/issue-53-resolution-proposal' into merge-decimal
merge both decimal implementations for G1 (#53, #58, #65)
improve performance for g1 log files without PrintAdaptiveSizePolicy
add Ryan Gardner and Stephan Schroevers to the list of contributors
some refactoring
fix UnsupportedOperationException in #displayUrlIsSupported()
prevent Exception when reading file from URL