Add La Maison du BitCoin

Add 2014-07-10-la-maison-du-bitcoin.md.
Correct Maison du BitCoin creation date
Fix several spelling and grammar omissions
Update Maison du BitCoin Twitter link
Resize la-maison-du-bitcoin images

Resize images contained in 2014-07-10-la-maison-du-bitcoin.md to 710px
in order to fit in better with paragraph widths.
Merge remote-tracking branch 'origin/la-maison-du-bitcoin'