Improved Helical tomo, projection ordering and Mac support

Fix Mac compatibility

Changed unix and mac checking, as unix=linux&mac
Aslo added xml.

Major bug Fixes

NOTE: previous releases may had a bug that did make demos not work properly.

That has been fixed in this release. DO use this version, re-download TIGRE and recompile it.

Better Linux&toolbox compatibility

Remove dependency to Statistics Toolbox

Removed the use of normrnd, poissrnd and prctile from the code for users without Statistical toolbox

Resolves: #6

3D Parallel beam added to TIGRE

1.1.0

Merge branch 'master' of https://github.com/CERN/TIGRE

Bug fixes and other minor things

v1.0.1

Update README.md

First release of TIGRE

v1.0.0

Fixed Issue #8