redmine: upgrade to redmine-2.4.2
README: updated current version to 2.4.2
Merge branch 'feature/redmine-2.4.2'
plugins: fix installation of open_flash_chart assets
themes: upgrade A1 theme to v1.1.2
themes: upgrade Coffee theme to v0.0.4
themes: upgrade RedmineCRM theme to v0.0.2
themes: upgrade GitMike them to r6
themes: added Highrise theme
Merge branch 'feature/themes-update'