Add a Project file, remove REQUIRE, declare version 1.0 (#88)

Changes:
* Raise the minimum Julia version to 1.0
* Simplify the Travis coverage submission setup
* Test on Julia 1.0 (LTS), 1.3 (stable), and nightly
* Add a Project.toml file
* Set the package version to 1.0.0
* Remove the now-unused REQUIRE file
* Add a standard .gitignore file

.gitignore

@@ -0,0 +1,6 @@
+*.jl.cov
+*.jl.*.cov
+*.jl.mem
+docs/build
+docs/site
+Manifest.toml

.travis.yml

@@ -1,16 +1,11 @@
 language: julia
 os:
-    - linux
+  - linux
 julia:
-    - 0.7
-    - 1.0
-    - nightly
-sudo: false
+  - 1.0
+  - 1.3
+  - nightly
 notifications:
-    email: false
-#script:
-#    - if [[ -a .git/shallow ]]; then git fetch --unshallow; fi
-#    - julia -e 'Pkg.clone(pwd())'
-#    - julia -e 'Pkg.test("Combinatorics", coverage=true)'
-after_success:
-    - julia -e 'Pkg.add("Coverage"); cd(Pkg.dir("Combinatorics")); using Coverage; Coveralls.submit(Coveralls.process_folder()); Codecov.submit(process_folder())'
+  email: false
+codecov: true
+coveralls: true

Project.toml

@@ -0,0 +1,17 @@
+name = "Combinatorics"
+uuid = "861a8166-3701-5b0c-9a16-15d98fcdc6aa"
+version = "1.0.0"
+
+[deps]
+Polynomials = "f27b6e38-b328-58d1-80ce-0feddd5e7a45"
+
+[compat]
+Polynomials = "0.5, 0.6"
+julia = "1"
+
+[extras]
+LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[targets]
+test = ["LinearAlgebra", "Test"]