Add travis CI info.

.travis.yml

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+language: python
+python:
+  - "2.7"
+#  - "3.2"
+#  - "3.3"
+# install some archive programs
+before_install:
+  - sudo apt-get update -qq
+  - sudo apt-get install -qq arj bzip2 cabextract compress cpio lzop p7zip-full pbzip2 unrar-nonfree zip rpm2cpio binutils lha unace-nonfree nomarch unalz lrzip star rzip zoo xdms orange lzip clzip pdlzip
+# command to install dependencies
+install:
+  - pip install -r requirements.txt --use-mirrors
+# command to run tests
+script: make test
+#notifications:
+#  email: false

requirements.txt

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+# no other Python packages needed