Update concepts.adoc

fixed typos
Merge pull request #1 from domdorn/patch-1

Update concepts.adoc - fixed typos
Added instructions for all of the mods.
Merge pull request #3 from AdityaGupta1/master

Added instructions for all of the mods.
updated version of the D4K Presentation Templates
English translation of the NAO workshop presentation (thanks to Stephen Chin and Nicolas Rigault)
Merge branch 'master' of https://github.com/devoxx4kids/materials

Conflicts:
	workshops/java/chapters/fundamentals.adoc
Merge branch 'master' of https://github.com/devoxx4kids/materials