[fix_jira_143] Updated version of some plugins.
               Changed scm from svn to git (on GitHub).
               Updated version of mind-maven-skin used in site.xml.
               Updated version of mind-parent in mind-maven-skin/pom.xml.
               Added a contributor.
[fix_jira_143] Updated version of some plugins.

cobertura-maven-plugin 2.5.1 -> 2.6
maven-assembly-plugin 2.3 -> 2.4
docbkx-maven-plugin 2.0.12 -> 2.0.15
maven-site-plugin 3.0 ->3.3
Merge pull request #1 from valeriebertin/fix_jira_143

Fix_jira_143 - Updated version of several plugins.
Fix for AetherClassNotFound error: https://cwiki.apache.org/confluence/display/MAVEN/AetherClassNotFound
Removed XSL from module and moved it to mind-parent module, added module assembly
Reworked mind-parent to avoid build error with empty maven cache, added mind-parent-resoures
Mind diff User Guide finalization, CSS are moved to mind-parent-resources
Move all "plugins" to "pluginManagement" to fix Eclipse/m2e support.
Fix dependency unpack running + eclipse m2e ignore in auto build.
Eclipse config for easier import
Merge mind-parent/pom.xml