Corrected calculation of dispersivity tensor in TransportDG and updated tests.
Closes #96.
Use gtest 1.7.0.

- needs minor modification in gtest_mpi.*
Delete old gtest version.
Describe derivation of fracture equations.

Improvement of documentation.
Corrections to reference manual (derivation of advection-diffusion model on domains with lower dimensional fractures).
Fix jankins publishers on linux.

- fix doc generation
- fix packaging on linux (need to ignore build_tree)
- make publishers for doc and packages to copy it to bacula
Merge branch 'master' of github.com:flow123d/flow123d
Remove temporary package data.
Fix jenkins config and README links.

- fix shell command for package generation
- fix links in README.md
Fix build status badge.
Fix calculation of mass balance fluxes.
- fluxes were not multiplied by porosity
- positive/negative balance should depend on the sign of water flux, not on mass flux (for consistency when concentrations are negative)
Closes #35.
Documentation latex packages usage edited.

- remove packages/subcaption.sty
- fix hyperref warning about backref
Package 'etoolbox' (used in flow_doc.sty) added in ref manual.
Update README.md

Add LaTeX reference manual build information.
Merge branch 'master' of https://github.com/flow123d/flow123d
Revised documentation of Darcy flow model.
Try to use g++ 4.8 on ci2.
Merge branch 'master' of github.com:flow123d/flow123d
Clear explicit compiler setting for ci2.
Error message when without BDDCML.

- reports error when try to use BDDCML solver
  while not built with its support