Fix #55 properly (and possibly #51)

Removed global environment variable fix. Problem seemed to stem from using apply function to convert columns from numeric incorrectly; lapply fix seems to work as expected. Issue #51 seems like it might be similar problem, so hopefully this fix eliminates that issue as well.

This should represent final fix for version 1.3.3, with no more CRAN versions until v1.4 for the new Adobe API