add Pregelix codebase

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format code use the new coding style

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update pregelix pom files

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Added IPageCleanerPolicy

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add preglix buffer cache flush policy

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update poms and scripts

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add more scripts

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update startnc script and the driver

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update pregelix-core pom

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remove dependency on btreehelper

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add hadoop config before adding paths

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fix driver hadoop environment

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fix application installation

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fix application name

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fix hadoop patch jar

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update store config delimiter

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remove dependencies on hadoop-compat

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set frame size in jobspecs

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update copyright header for pregelix source code

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add more comments for Vertex abstract class

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