[WIP][Frontend] Scala/Java package (#176)

* JVM package skeleton

* [JVM] link libtvm.so and list function names

* [JVM] Function & NDArray skeleton

* [JVM] TVMFuncCall in JNI

* [JVM] handle string arg in TVMFuncCall

* [JVM] get module function

* [JVM] entry function for Module

* [JVM] construct Module from function return value

* [JVM] TVMContext, TVMArray attributes

* [JVM] NDArray from / to java array

* [JVM] load so and compute on cpu

* [JVM] move PackedFunc to individual modules

* [JVM] assembly package & native library loader

* [JVM] unit test & codestyle check settings

* [JVM] NDArray from & to different dtypes

* [JVM] NDArray from native double array. Add linux-cpu profile.

* [JVM] modify Makefile

* [JVM] add linux-x86_64-gpu profile

* [tvm4j] delay load libtvm_runtime.so

* [tvm4j] refactor to pure java

* [tvm4j] remove scalastyle-config.xml

* [tvm4j] remove link HalideIR, remove Shape, remove scala binary versions

* [tvm4j] only allow convert from/to same type array

* [tvm4j] make NDArray api more readable

* [tvm4j] refactor for c api

* [tvm4j] add Jenkins tests

* [tvm4j] fix duplicate Dockerfile cmd

* [tvm4j] fix ut script filename

* [tvm4j] add module load tests

* [tvm4j] add javadoc, remove types package

* [tvm4j] fix test script

* [tvm4j] remove ut temp dir

* [tvm4j] fix missing package types

* [tvm4j] java code style check

* [tvm4j] fix java lint

* [tvm4j] downgrade checkstyle plugin for JDK7

* [tvm4j] add stylecheck in jenkins tests

* [tvm4j] specify source file encoding

* [tvm4j] lazy init function; add Function.call() api; allow manully release Module,NDArray,Function

* [tvm4j] fix ModFree

* [tvm4j] cache Function in API