add travis-ci configuration for multiple build enviroments

.travis.yml

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+language: python
+python:
+    - 2.6
+    - 2.7
+env:
+    - BUILDENV=lucid
+    - BUILDENV=precise
+    - BUILDENV=latest
+before_install:
+    - sudo apt-get update -qq
+    - sudo apt-get install -qf python-libxml2
+install:
+    - pip install --use-mirrors -r .travis/requirements-$BUILDENV.txt
+script:
+    - trial scrapy scrapyd

.travis/requirements-latest.txt

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+pyOpenSSL
+lxml
+twisted
+boto
+.

.travis/requirements-lucid.txt

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+pyOpenSSL==0.10
+lxml==2.2.4
+twisted==10.0.0
+boto==1.9b
+.

.travis/requirements-precise.txt

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+pyOpenSSL==0.12
+lxml==2.3.2
+twisted==11.1.0
+boto==2.2.2
+.