Prefix C object names with git2r_ in src/git2r_commit.c/h
Added target Makevars in Makefile

* Makefile: Added target Makevars to rebuild Makevars.in and
  Makevars.win
Fix missing prefix git2r_ in .Call

* Added prefix in the call to:
  - git2r_commit
  - git2r_descendant_of
  - git2r_parents
Fix tree pointed to by a commit or stash

* R/tree.r (tree): Added prefix git2r_ in .Call to function
  git2r_commit_tree

* src/git2r.c: Added missing git2r_commit_tree to callMethods
Prefix C object names with git2r_ in src/git2r_config.c/h
Fix broken build
Prefix C object names with git2r_ in src/git2r_error.c/h
Prefix C object names with git2r_ in src/git2r_push.c/h
Prefix C object names with git2r_ in src/git2r_repository.c/h

* src/git2r_repository.c/h: Changed function names to have similar
  naming scheme as libgit2 with function names also prefixed with
  modulename. git2r_modulename_functionname() (e.g. git2r_repository_open())
Prefix C object names with git2r_ in src/git2r_repository.c/h
Prefix C object names with git2r_ in src/git2r_stash.c/h
Prefix C object names with git2r_ in src/git2r_status.c/h
Prefix C object names with git2r_ in src/git2r_tag.c/h
Prefix C object names with git2r_ in src/git2r_tree.c/h
Prefix git2r C functions with git2r_modulename_

* Changed function names to have similar naming scheme as libgit2 with
  function names also prefixed with
  modulename. git2r_modulename_functionname() (e.g. git2r_repository_open())
Roxygenized with roxygen2_4.0.1
Moved git2r C functions to correct module

* The git2r C functions are prefixed with
  git2r_modulename_functionname() where git2r_modulename determines
  the name of the source/header file, e.g. git2r_repository_open() is
  in git2r_repository.c and git2r_repository.h
Fix compiler warnings
Added method to get content of a blob

* R/blob.r (content): Added generic content and method for S4 class
  git_blob to get content. Return content either as a vector of
  character strings or as one character string

* man/contents-methods.Rd: Added documentation

* src/git2r_blob.c/h (git2r_blob_content): Added C code to get rawcontent
  of a blob.

* src/git2r.c: Added "git2r_blob_content" to callMethods

* NAMESPACE: Updated
Fix failing blob content test case