refreshing GitHub API key

adding MonoDevelop and VisualStudio for Mac ver 8.x support

bumping 7.x. addin version to v3.0.4

bumping 6.x. addin version to v2.0.6

bumping 5.x addin version to v1.0.12

Merge branch '7.x_travis' into 7.x

bumping addin version of v5.x branch to v1.0.10

Merge remote-tracking branch 'origin/v7.x_travis' into v7.x

it's hard to find MonoDevelop 6.x for Linux

using dependencies from lib/6.x folder

adding a "Windows" suffix to addin name for Win32 build