fix bug in symbolic link creation when using existing AnalysisSuite checkout
v0.3.1
Move load functions from install.R into separate load.R
automatically load AnalysisSuite code on package load
Load into nat.as package namespace

* this obviously keeps things much tidier
* but requires an exportPatter to ensure all AnalysisSuite objects
  are on search path
Add simple reload_analysis_suite() function
update package docs

* nb also includes @exportPattern roxygen tag
remove extraneous load functions and make .require_analysis_suite() internal

* require_analysis_suite should not be called directly because it is
  designed for use inside the .onLoad function.
* calling it directly would load code into the global namespace
improved package docs especially install instructions
Teach analysis_suite_dir to accept additional arguments
add test_analysis_suite()
prepare v0.4 release
README.md updates for v0.4 release