Updated installation instructions

Split the installation instructions into different sections. Added a section to
explain how to do installation just for the project using Bundler.

Also added instructions how to run jekyll if Bundler has been used to install
the gems.
add blogpost advisory board
add big advisory board image
Merge branch 'gh-pages' into stage

Conflicts:
	blog/_posts/2014-05-12-advisory-board.md
towards mobile optimizations
chore(sass): Remove Cache, add ignore rule to .gitignore
Launch Unterseite
added members to project
added two projects to berlin lab
fixed typo
fixed url
docready for mapinit
Add Altglas projects (website & Android app).
Merge pull request #123 from johnjohndoe/add-altglas-projects

Add Altglas projects (website & Android app).
Update events.yml
Update index.html

Subscribe link der Mailingliste hinzugefügt
Merge pull request #124 from marhem/patch-7

Update index.html
gießen: changed eventinfo, added new member
Merge pull request #125 from serofax/gh-pages

ok lab gießen - changed eventinfo and added new member
Nächstes Treffen ergänzt