Arreglando cosas de la intro
Merge branch 'master' of https://github.com/geneura-papers/2015-Evostar
Modification of introduction (Issue #6)

To continue with issue #6, I've modified the Introduction and moved and re-wrote some paragraphs.
Added new references to references.bib file and modified identifiers to match with our geneura.bib file instead.