Added ECNA 2013.
Added omegaUp's XOR.
Added omegaUp's Menor base para palíndromo.
Added omegaUp's Wall-E.
Added omegaUp's Finales Alternativos.
Added omegaUp's Números triangulares.
Added omegaUp's Orientación.
Added omegaUp's Dos bases numéricas.
Merge branch 'master' of github.com:frcepeda/Contest-Archive