Fix #29. Adds \url{} commands for URLs.
Fix #15. Add introduction to Iris built-in functions. Removes subsection 'Data Management' title from SED Builder section.
Fix conflict with merging 527447460daa
Add missing url commands. Add Sherpa ASCL citation to acis.bib. Update to latest version.
Update to latest version. Fix conflicts.
Update (fix conflict).
Merge pull request #37 from jbudynk/master

Fix #15 and #29.