Footprint for 6N137 and TLE2426

6N137 - High Speed Optocoupler
(http://www.fairchildsemi.com/ds/6N/6N137M.pdf)
TLE2426 - Virtual Ground:
http://www.ti.com.cn/cn/lit/ds/symlink/tle2426.pdf

Also corrected library for Ferrite Bead as it had no pin assignments.