Remove gogit and major refactoring (#2)

* Fix typo in readme

* Reimplement all git methods without go-git

* Rename repo pkg to git, add gitconfig methods

* Improve tests for configuration reading

* Rename package file to io and move RepoFinder there

* Refactor printers

- Remove smart printer
- Decouple printers from git repos with interfaces
- Update printer functions
- Remove unnecessary flags
- Add better remote URL detection

* Update readme and go.mod

* Add author to git commit in tests

Otherwise tests will fail in CI.

* Install git before running tests and don't use cgo

* Add better error message, revert installing git

* Ensure commit message is in quotes

* Set up git config before running tests

go.mod

@@ -3,13 +3,15 @@ module git-get
 go 1.14
 
 require (
-	github.com/go-git/go-billy/v5 v5.0.0
-	github.com/go-git/go-git/v5 v5.1.0
 	github.com/karrick/godirwalk v1.15.6
+	github.com/kr/text v0.2.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0
+	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
 	github.com/pkg/errors v0.9.1
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/viper v1.7.0
+	github.com/stretchr/testify v1.4.0 // indirect
 	github.com/xlab/treeprint v1.0.0
-	golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073
+	golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527 // indirect
+	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 )