Merge pull request #465 from sortega/issue/193_pidfile

Introduce a pidfile to avoid having multiple instances running
Fix WindowsPidUtils
Merge pull request #466 from sortega/fix4win

Fix WindowsPidUtils
Update Changelog file with latest changes
Merge pull request #470 from apoloval/port/469

[PORT] Update Changelog file with latest changes
Limit Windows version in installer to Windows Vista or greater
Merge pull request #473 from apoloval/port/471

[PORT] Limit Windows version in installer to Windows Vista or greater
Fix http links on Linux
Merge pull request #472 from sortega/issue/192_fix_links

Fix http links on Linux