release bmath 4.0.0 & libbmath.so.2

Remove -d,--detached option

The -d,--detached argument was added at a time where I wasn't sure if
there was going to be positional arguments added. I've always felt this
option was a bit confusing, so remove it.

Release version bmath 2.0; libbmath 1.0

Major version upgrade due to major API changes. Proper order of
operations were introduced, therefore any current usage will no longer
work as intended. Hard-coded functions are now introduced to improve
usefulness of tool. New operators such as -, +, *, % are introduced as
well as signdness for numbers.

allow setting error & output streams

Before making this tool a library, it made sense to set output to either
stderr/stdout as necessary. But now as a library, users should be able
to specify their error or output streams themselves defaulting to
stderr/stdout respectfully. Therefore, allow users to set their
error/out streams.

release 1.0.3