added failing finite diff test for agrad mdivide_left_ldlt
added tests for derivative overflow/underflow and doc about overflow/underflow to manual.  completes fix of #376
Fix LDLT finite difference tests.
added more tests for log_determinant
Revert "changing implementation of OperandsAndPartials to return runtime errors instead of seg-faults when accessing invalid partial derivatives"

This reverts commit 38190ec30fbc2c7f19d3745f3bee9d3c8adc4ab2.
Revert "updating error message from DoubleVectorView"

This reverts commit b5859d19f5d7ab5c20948461873d28633ba7947d.
Revert "adding size() function to DoubleVectorView"

This reverts commit 7869e7cd980bb84ec6c0a92179d3a5f26e950f6d.
updating VectorView to take an additional template parameter to throw when accessed; added tests
added test for trace_gen_inv_quad_form_ldlt using basic math and auto-diff
changed include order of multiply
complete fix for #432, fixing writer to call transform with tests for inf, fixing commmand spelling
Merge pull request #430 from stan-dev/bugfix/issue-376-Phi-tails

Fixes #376.
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
merged makefile changes and updated paths and all tests pass
Merge pull request #433 from stan-dev/bugfix/issue-432-pos-inf-ub

Fixes #432.
Merge branch 'develop' of https://github.com/stan-dev/stan into develop
testing mdivide_right_ldlt. tests fail
adding math test for trace_inv_quad_form_ldlt
added tests for trace_inv_quad_form_ldlt for gradients checking against auto-diff implementation