Set up documentation + lint (#121)

- remove some automatically generated stuff not should even be in
repository
- set up lint + Documents.jl in same way it is defined in freshly started projects
- add lint + doctest to after_success so that build pass, these needs to be fixed later
- build is failing on nightly (0.7) but it's ok for release (0.5.2)
- Documenter.jl supports doctests, so this closes least #23
- build system is now on Travis-CI completely, so this closes also #68

test/run_lint.jl

@@ -0,0 +1,17 @@
+# This file is a part of JuliaFEM.
+# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
+
+using Lint
+using Base.Test
+
+results = lintpkg("JuliaFEM")
+if !isempty(results)
+    info("Lint.jl is a tool that uses static analysis to assist in the development process by detecting common bugs and potential issues.")
+    info("For this package, Lint.jl report is following:")
+    display(results)
+    info("For more information, see https://lintjl.readthedocs.io/en/stable/")
+    warn("Package syntax test has failed.")
+    @test isempty(results)
+else
+    info("Lint.jl: syntax check pass.")
+end