Update egrep to grep -E

    egrep is the same as grep -E. fgrep is the same as grep -F. rgrep is the
    same as grep -r. Direct invocation as either egrep or fgrep is
    deprecated, but is provided to allow historical applications that rely
    on them to run unmodified.
Merge pull request #86 from elyezer/deprecate-egrep

Update egrep to grep -E