Merge pull request #21 from sunnycomes/sunnycomes

Merge code from sunnycomes.
Change margin-left of #main box to a proportion value, then it will resize when the browser window changes.
Change margin-left of #header_index box to a proportion value, then it will resize when the browser window changes.
Merge branch 'master' of https://github.com/sunnycomes/IoVision into sunnycomes