Use address rather than value in several conservative registrations.

While doing some debugging for #277, I compiled with NM_GC_CONSERVATIVE defined, and found that the code no longer compiled!  This was due to a number of places where I was unregistering a value instead of a pointer.  I've fixed this by passing addresses instead, which allows nmatrix to compile with the conservative gc flag on.
(One additional address vs. value usage I missed due to not cleaning up properly.)
Documentation for HB and Fortran format readers
Use address rather than value in several conservative registrations.

While doing some debugging for #277, I compiled with NM_GC_CONSERVATIVE defined, and found that the code no longer compiled!  This was due to a number of places where I was unregistering a value instead of a pointer.  I've fixed this by passing addresses instead, which allows nmatrix to compile with the conservative gc flag on.

(One additional address vs. value usage I missed due to not cleaning up properly.)
Merge branch 'cjfuller-nm_conservative_compile_errors'
Merge branch 'master' of github.com:SciRuby/nmatrix
Merge branch 'master' of github.com:SciRuby/nmatrix

(One additional address vs. value usage I missed due to not cleaning up properly.)
Merge branch 'cjfuller-nm_conservative_compile_errors'
Merge pull request #278 from cjfuller/nm_conservative_compile_errors

Use address rather than value in several conservative registrations.
LAPACK free matrix inversion.
Bug fix in Rational division.
LAPACK free matrix inversion and unary #round. Fixed bug in rational aritmetic.
LAPACK free matrix inversion using Gauss-Jordan elimination.

LAPCK free matrix inverse
Wrote tests for LAPACK free matrix inversion

Wip

LAPACK free matrix inversion

Flip back of columns remaining

Column unscramble

Fixed bug in rational abs and inverse refactor

test

Tests for #round

Fixed insane rational arithmetic bug

Added #round and dtype verfiers

Rational arithmetic fix

Matrix exact inverse with lda ldb

Rational division fix
Merge pull request #286 from v0dro/inverse

LAPACK free matrix inversion using Gauss-Jordan elimination.
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