Google Docs Viewer can now handle .pptx and .xlsx files.
Google Docs Viewer can now handle .pptx and .xlsx files.

Closes #68.

10layer/alaveteli,Br3nda/alaveteli,Br3nda/alaveteli,datauy/alaveteli,andreicristianpetcu/alaveteli,obshtestvo/alaveteli-bulgaria,andreicristianpetcu/alaveteli_old,nzherald/alaveteli,hasadna/alaveteli,hasadna/alaveteli,codeforcroatia/alaveteli,andreicristianpetcu/alaveteli_old,sarhane/alaveteli-test,hasadna/alaveteli,nzherald/alaveteli,petterreinholdtsen/alaveteli,sarhane/alaveteli-test,10layer/alaveteli,4bic/alaveteli,datauy/alaveteli,andreicristianpetcu/alaveteli,4bic/alaveteli,sarhane/alaveteli-test,andreicristianpetcu/alaveteli,10layer/alaveteli,nzherald/alaveteli,nzherald/alaveteli,4bic/alaveteli,petterreinholdtsen/alaveteli,andreicristianpetcu/alaveteli_old,codeforcroatia/alaveteli,andreicristianpetcu/alaveteli,andreicristianpetcu/alaveteli,Br3nda/alaveteli,andreicristianpetcu/alaveteli_old,obshtestvo/alaveteli-bulgaria,Br3nda/alaveteli,petterreinholdtsen/alaveteli,petterreinholdtsen/alaveteli,Br3nda/alaveteli,TEDICpy/QueremoSaber,4bic/alaveteli,codeforcroatia/alaveteli,TEDICpy/QueremoSaber,datauy/alaveteli,hasadna/alaveteli,codeforcroatia/alaveteli,4bic/alaveteli,sarhane/alaveteli-test,obshtestvo/alaveteli-bulgaria,obshtestvo/alaveteli-bulgaria,TEDICpy/QueremoSaber,TEDICpy/QueremoSaber,obshtestvo/alaveteli-bulgaria,andreicristianpetcu/alaveteli_old,hasadna/alaveteli,nzherald/alaveteli,petterreinholdtsen/alaveteli,hasadna/alaveteli,TEDICpy/QueremoSaber